Updated on 2024/12/22

写真a

 
WATANABE Naoki
 
Organization
Research Institute for Natural Hazards and Disaster Recovery Associate Professor
Graduate School of Science and Technology Environmental Science and Technology Associate Professor
Title
Associate Professor
External link

Degree

  • Doctor (Science) ( 1995.3   Niigata University )

  • 修士(理学) ( 1992.3   新潟大学 )

Research Interests

  • Engineering Geology

  • Hydrogeology

Research Areas

  • Natural Science / Solid earth sciences

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Disaster prevention engineering

Research History (researchmap)

  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology   Associate Professor

    2011.4

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  • Niigata University   Associate Professor

    2011.4

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  • Niigata University   Research Center for Natural Hazards and Disaster Recovery   Associate Professor

    2009.10 - 2011.3

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  • Niigata University   Research Center for Natural Hazards and Disaster Recovery   Lecturer

    2006.4 - 2009.9

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  • Niigata University   Lecturer

    1998.4 - 2006.3

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  • Niigata University   Assistant

    1996.5 - 1998.3

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Research History

  • Niigata University   Research Institute for Natural Hazards and Disaster Recovery Research Division of Hazard Mitigation   Associate Professor

    2014.4

  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology   Associate Professor

    2011.4

  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology   Associate Professor

    2011.4

  • Niigata University   Research Center for Natural Hazards and Disaster Recovery   Associate Professor

    2011.4 - 2014.3

  • Niigata University   Research Center for Natural Hazards and Disaster Recovery   Associate Professor

    2009.10 - 2011.3

  • Niigata University   Research Center for Natural Hazards and Disaster Recovery   Lecturer

    2006.4 - 2009.9

  • Niigata University   Lecturer

    1998.4 - 2006.3

  • Niigata University   Research Assistant

    1996.5 - 1998.3

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Papers

  • Large-scale landslides due to saline water plume intrusion - an example of the Okimi landslide in Niigata Prefecture, Japan Reviewed

    Naoki WATANABE, Hisanori SATO, Gen FURUYA

    Proceedings of Scientific and Expert Conference Geo-Expo 2024, Geotechnical Society of Bosnia and Herzegovina   33 - 39   2024.10

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Geotechnical Society of Bosnia and Herzegovina  

    Large-scale landslides with volumes ranging from tens to hundreds of millions of m3 are scattered throughout Niigata Prefecture, Japan. There is no accepted theory, although many researchers have argued about the mechanism of these landslides. Highly concentrated Na-Cl type groundwater (hereafter called "saline water") has often been found in large-scale landslides in Niigata Prefecture. In addition, the observation wells where saline water occurs are sometimes flowing wells. We also pay special attention to the distribution of landslide-prone areas and oil and gas fields in Niigata Prefecture, which generally overlap, and saline water from landslides is originally fossil seawater such as oil-brine based on geochemical characteristics. On the other hand, anomalous high-pressure reservoirs at depths of more than 1,000 m in oil and gas fields have been known since the 1960s and are possible saline water sources. We believe saline water's behavior is key to better understanding the mechanism of large-scale landslides. The Okimi landslide, this research area, is located in the Kamiya area, Joetsu City, western part of Niigata Prefecture, Japan. The aspect of the active body is about 500 m wide and 1,500 m long, with an area of about 70 ha. The bedrock geology is mainly Neogene unconsolidated mudstone. According to previous studies, saline water has been detected in observation wells at the head of this landslide. Since the geological formation containing saline water has a considerably low resistivity value (≤ 2.0 Ωm), the CSMT method is best suited for electromagnetic exploration to visualize the resistivity up to 1,000 m depth. The survey results confirm the existence of a saline water plume rising from a "saline water chamber" located 100 to 300 m below the western side of this landslide to the bottom of this landslide (at a depth of about 30 m). The presence of the saline water plume suggests that the upwelling of saline water from the anomalous high-pressure reservoir (saline water chamber) is closely related to several large-scale landslides.

    DOI： 10.35123/geo-expo_2024_4

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  • Hydrochemical indicators to predict clogging of drainage pipes by slime accumulation Reviewed

    Shohei DOBASHI, Takuma HESHIKIRI, Takashi WATANABE, Taisuke MORIOKA, Takashige AOKI, Naoki WATANABE

    Journal of the Japan Landslide Society   61 ( 3 )   84 - 90   2024.5

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    DOI： 10.3313/jls.61.84

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  • Numerical Evaluation of the Effect of Drainage Wells on the Stability of the Ichiba No. 1 Landslide During an Mj6.7 Earthquake

    Fei Cai, Akihiko Wakai, Naoki Watanabe, Gonghui Wang, Gen Furuya

    I. Towhata et al. (eds.), Coseismic Landslides, Springer Natural Hazards   573 - 600   2022.11

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    Publishing type：Part of collection (book)   Publisher：Springer Nature Singapore  

    DOI： 10.1007/978-981-19-6597-5_15

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  • Retrofitting method for drainage well by replacing liner-plate wall with exterior concrete Reviewed

    Takashi WATANABE, Taisuke MORIOKA, Kunihiko KOSAKAI, Naoki WATANABE

    Journal of the Japan Landslide Society   59 ( 6 )   260 - 264   2022.11

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Landslide Society  

    DOI： 10.3313/jls.59.260

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  • Review of monitoring parameters of the kostanjek landslide (Zagreb, Croatia) Reviewed

    Martin Krkač, Snježana Mihalić Arbanas, Željko Arbanas, Sanja Bernat, Kristijan Špehar, Naoki Watanabe, Osamu Nagai, Kyoji Sassa, Hideaki Marui, Gen Furuya, Chunxiang Wang, Josip Rubinić, Koji Matsunami

    Landslide Science for a Safer Geoenvironment: Volume 2: Methods of Landslide Studies   ( 2 )   637 - 643   2014.1

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    Language：English   Publishing type：Part of collection (book)   Publisher：Springer International Publishing  

    Since 2011, in the framework of the Croatian-Japanese SATREPS FY2008 Project, scientists have been working on the establishment of the Kostanjek landslide monitoring system in the City of Zagreb (Croatia). External triggers at Kostanjek landslide are measured with rain gauge and accelerometers. Displacements at the surface are measured by GNSS sensors and extensometers, while subsurface displacement is measured by vertical extensometers and inclinometer. Hydrological measurements consist of groundwater level measurements, discharge measurements, chemical and isotope analysis. Monitoring sensors recorded landslide reactivation due to external triggers in the winter period of 2012/2013. During the period from September 2012 toMarch 2013 the total cumulative precipitation was 793.7mmand horizontal displacements were in the range of 9-20 cm. The installed monitoring sensor network proved to provide reliable data for the establishment of relations between landslide causal factors and landslide displacement rates aimed at establishing threshold values for early warning system.

    DOI： 10.1007/978-3-319-05050-8_99

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  • Water Quality and Isotopic Characteristics of Lagoon Waters in Niigata Prefecture : In Comparison with Zhalong Wetland at Heilongjiang Province in China Reviewed

    TIEMUER Adiljiang, KANO Naoki, IMAIZUMI Hiroshi, LI Chong, WATANABE Naoki, ZHENG Yongjie

    RADIOISOTOPES   62 ( 7 )   409 - 421   2013.7

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Radioisotope Association  

    In order to reveal the quality and isotopic characteristics of lagoon waters in Niigata Prefecture in recent years, the nutrients concentrations of nitrogen (N) and phosphorus (P) as well as oxygen stable isotope ratios(i.e., δ<sup>18</sup>O) in water samples of Sakata and Toyanogata were measured.<br>Samples were regularly taken at the fixed sampling points from these lagoons, and depth distribution was surveyed at one point in Toyanogata. In addition, δ<sup>18</sup>O and nutrients concentrations of water samples in Zhalong Wetland at Heilongjiang Province in China were also determined.<br>Consequently, the following matters have been mainly clarified. (1) δ<sup>18</sup>O values of sample waters in Zhalong Wetland are generally large probably because of the effect of evaporation, whereas those of Sakata lagoon are large which may be due to the biological process such as the activity of plankton. (2) Considering the results of nutrients concentrations, the water quality of lagoon (Sakata and Toyanogata) waters in Niigata Prefecture is better than that of Zhalong Wetland in China.

    DOI： 10.3769/radioisotopes.62.409

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    Other Link： http://hdl.handle.net/10191/30806

  • Two integrated models simulating dynamic process of landslide using GIS Reviewed

    Chunxiang Wang, Hideaki Marui, Gen Furuya, Naoki Watanabe

    Landslide Science and Practice: Spatial Analysis and Modelling   3   389 - 395   2013

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    Two major movement modes of slope failures: landslides and debris-flows are simulated by two integrated models using GIS to represent the dynamic process across 3D terrains. Landslides occur when earth material moves downhill after failing along a shear zone. Debris flows can be differentiated from landslides by the pervasive, fluid-like deformation of the mobilized material. The formation of debris flows most often occurs as a result of a landslide partially or completely mobilizing into a debris flow. GIS-based revised Hovland's 3D limit equilibrium model is used to simulate the movement and stoppage of a landslide. The 3D factor of safety will be calculated step by step during the sliding process simulation. Stoppage is defined by the factor of safety much greater than one and the velocity equal zero. GIS-based depth-averaged 2D numerical model is used to predict the runout distance and inundated area of a debris flow. The simulation displays the propagation and deposition and deposition of a debris flow across the complex topography. The two GIS-based integrated models are able to provide effective tools for hazard mapping and risk assessment. © Springer-Verlag Berlin Heidelberg 2013.

    DOI： 10.1007/978-3-642-31310-3-53

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  • Hydrochemical characteristics of groundwaters from the Kostanjek landslide in Croatia Reviewed

    Naoki Watanabe, Martin Krkač, Gen Furuya, Chunxiang Wang, Snjezana Mihalić

    Proceedings of 2nd Project Workshop on Risk Identification and Land-Use Planning for Disaster Mitigation of Landslides and Floods Rijeka (Croatia), 2011   14 - 16   2012.9

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  • Dynamic simulation of landslide and debris flow in the Rječina River valley, Croatia Reviewed

    Chunxiang Wang, Hideaki Marui, Gen Furuya, Naoki Watanabe

    Proceedings of 2nd Project Workshop on Risk Identification and Land-Use Planning for Disaster Mitigation of Landslides and Floods Rijeka (Croatia), 2011   24 - 28   2012.9

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  • A two-step procedure for hazard prediction and assessment of landslide and debris flow Reviewed

    Chunxiang Wang, Hideaki Marui, Gen Furuya, Naoki Watanabe

    Proceeding of 12th Congress INTERPRAEVENT, Grenoble, France, 2012   397 - 408   2012.4

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Research Society INTERPRAEVENT  

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  • Characteristics of oxygen stable isotopic ratio in precipitations in Niigata Prefecture, Japan Reviewed

    Chong LI, Naoki KANO, Yuichi UENO, Mitsuru HANABUSA, Yurong JIAO, Hiroshi IMAIZUMI, Naoki WATANABE

    RADIOISOTOPES   59 ( 2 )   93 - 102   2010.2

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    DOI： 10.3769/radioisotopes.59.93

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  • Large-scale Landslides and Overpressured Hydrothermal System in the Niigata Area, Central Japan Reviewed

    WATANABE Naoki, SATO Hisanori, FURUYA Gen

    J. Geogr.   118 ( 3 )   543 - 563   2009.7

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Tokyo Geographical Society  

    High salinity Na-Cl-type geothermal waters have often been found in the anticlinal hilly terrains and landslide-prone areas of Niigata Prefecture by boring to depths of more than 1,000 meters. These fluid pressure gradients are much higher than the hydrostatic pressure gradient and approach the lithostatic pressure gradient with increasing depth. The geothermal waters in the Matsunoyama area, Tokamachi City, have the highest orifice temperature in Niigata Prefecture. Eight geothermal water wells in this area were drilled along the anticlinal axis of a nearby hilltop or higher breast of the Matsunoyama dome and ranged in depth from 170 to 1,170 meters and in temperature from 35 to 95°C. For example, the Takanoyu-1 geothermal water well is only 170 meters in depth but has an orifice temperature of 90°C. These waters show geyser action associated with methane gas, and typically have very high salinity with considerable amounts of chloride. Hydrogen and oxygen isotope values and chloride concentration of approximately 9,000mg/L suggest that the origin of the waters is altered fossil seawater trapped in organic-matter-bearing sedimentary rocks. The temperature and depth of the primary reservoir are estimated to be 139°C and 3,000 to 4,000 meters, respectively, using a Li-Mg geothermometer and the mean geothermal gradient of 30-40°C/km in the Niigata sedimentary basin. Na-Cl-type groundwaters emerged from several landslides located in the Higashi-kubiki and Naka-kubiki areas including the Matsunoyama area. Well loggings were carried out to profile the electric conductivity and hydrochemistry of groundwater in the Utsunomata landslide in the neighborhood of the Matsunoyama area. Profiles in the active landslide mass showed sharp increases of the electric conductivity and the NaCl components at around the depth of the sliding surface. In contrast, no significant variations of the profiles were recognized in the inactive landslide mass. Na-Cl-type groundwaters are formed by mixing deep Na-Cl-type geothermal waters with meteoric groundwaters. These phenomena suggest that the geothermal water injection into shallow aquifers in landslide mass generates a partially high pore water pressure around the sliding surface and causes landslides.

    DOI： 10.5026/jgeography.118.543

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    Other Link： https://jlc.jst.go.jp/DN/JALC/00334913632?from=CiNii

  • Hydrochemical characteristics of groundwaters in the Gosen-Muramatsu Basin, Niigata Prefecture Invited

    Annual report of the Institute of Environmental Geological Sciences   ( 20 )   53 - 63   2009.3

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    Language：Japanese   Publishing type：Research paper (other academic)  

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  • Middle Miocene back-arc volcanism in the Tappi-zaki area, Northeast Japan arc: plagioclase K-Ar age constraints

    Watanabe, N, Itaya, T, Ohki, J, Shuto, K

    Science Reports of Niigata University (Geology)   24 ( 24 )   91 - 108   2009.3

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  • Environmental characteristics of lagoon waters in Niigata Prefecture based on oxygen stable isotopic ratio and the concentrations of dissolved materials Reviewed

    Lu H, Kano N, Yashima Y, Amano Y, Li C, Imaizumi H, Watanabe N, Zheng Y

    RADIOISOTOPES   157 ( 7 )   405 - 418   2008.7

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    DOI： 10.3769/radioisotopes.57.405

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  • Chemical Weathering Rates from Watersheds in the Tateyama Caldera, Central Japan Invited Reviewed

    Watanabe N, Hizuka T, Cheibany O.E, Marui H

    Proceedings of the 11th INTERPRAEVENT Conference in DornBirn, Austria   1   537 - 546   2008.5

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  • 五頭山西麓の流域における溶存成分フラックス Invited

    渡部直喜, 小林裕美, ウルドゥ・エレミン=シェイバニ

    (財)環境地質科学研究所研究年報   ( 19 )   61 - 70   2008.3

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  • 2004年新潟県中越地震と地下水異常・活構造

    村山友之, 佐藤早苗, 氏原英敏, 森友紀, 豊島剛志, 渡部直喜, 和田幸永, 小安孝幸, 播磨雄太, 小林健太, 大川直樹, 小泉尚嗣

    新潟大学災害復興科学センター年報   1号   155 - 174   2007.7

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  • Depth-wise variation of physical and mechanical properties of mudstone in relation to weathering cases in several landslides in Niigata Prefecture Reviewed

    Bhattarai P, Marui H, Tiwari B, Watanabe N, Tuladhar G.R

    日本地すべり学会誌   44 ( 2 )   79 - 89   2007.7

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Japan Landslide Society  

    In order to study the physical and chemical weathering and their impact on the shear strength of the soil mass, soil samples were collected from different depths ranging from the ground surface to a depth of 15m at two different drainage wells in a Mukohidehara landslide area. These specimens represent the residual soil near the surface, specimen at a depth range of ground water level fluctuation, less weathered specimen from the depth below the ground water level fluctuation, the remolded soil from sliding zone and the specimen below sliding zone. Measurement of Atterberg's limits, particle size analysis, X-ray diffraction analysis, slake durability test and X-ray fluorescence tests were carried out. Drained simple shear tests, and drained ring shear tests were also conducted on those specimens to measure their strength characteristics.<br>Test results showed that fully softened shear strength of the less weathered specimen was very close to the peak shear strength of the specimen from the sliding zone. Test results showed no significant variations of index properties (liquid limit, plasticity index and clay fraction) , mineral compositions and chemical compositions with depth. Residual shear strengths of the specimen also did not vary much with depth. In order to compare these findings with rocks from the other types of formation, specimens were collected from the ground surface, ground water fluctuation zone, less weathered zone and sliding zone of three other landslides sites. The test results on the index properties, shear strength properties, mineralogical analysis, and bulk chemistry, of those landslides were consistent with the findings in Mukohidehara landslide.<br>The test results of this study suggested that physical weathering plays a major role in the reduction of shear strength of mudstone, in comparison to the chemical weathering in the form of mineralogical and chemical alteration. Test results also suggested that physical weathering by slaking and disintegration is significant at ground water fluctuation zone in those mudstone formations.

    DOI： 10.3313/jls.44.79

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  • Investigation of groundwater flows inducing fluidized landslides at source areas of debris flows in metamorphic mountains, Japan Reviewed

    Furuya G, Suemine A, Komatsubara T, Watanabe N, Marui H

    Disaster Mitigation of Debris Flows, Slope Failures and Landslides   2   481 - 489   2006.9

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  • Influence of weathering on physical and mechanical properties of mudstone Reviewed

    Bhattarai P, Marui H, Tiwari B, Watanabe N, Tuladhar G.R, Aoyama K

    Disaster Mitigation of Debris Flows, Slope Failures and Landslides   2   467 - 469   2006.9

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  • Relationship between groundwater flow estimated by soil temperature and slope failures caused by heavy rainfall, Shikoku Island, southwestern Japan Reviewed

    G Furuya, A Suemine, K Sassa, T Komatsubara, N Watanabe, H Marui

    ENGINEERING GEOLOGY   85 ( 3-4 )   332 - 346   2006.6

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

    Most of the slope failure disasters in a humid area such as that of Japan are caused by heavy rain. However, even for the case of heavy rainfall that occurs once in every 10 years, total area of slope failures seldom exceeds 10% of a watershed. From this background, we focused on the vein-like groundwater flows that increase pore-water pressure, and clarified the relationship between distributions of slope failures and groundwater veins. In this study, a 1-m-depth ground temperature survey and water-chemistry analyses at springs and boreholes were conducted in Zentoku area of Shikoku Island, southwestern Japan, to grasp the distribution of groundwater veins and their sources. Subsequently, slope-stability was analyzed to investigate the relationship between groundwater veins and slope failures at study sites. These results lead to the following conclusions: The slope failures appear to concentrate around shallow groundwater veins and groundwater veins rising from deep layers. This means that slope failures caused by these groundwater veins in addition to rainfall. Two types of groundwater originate in the deep layers: one has short storage time as indicated by the fact that dissolved substances are low; the other is stored for a lengthy period as noted by a high concentration of dissolved substances. By combining the results of stability analyses and distribution of groundwater veins, it is suggested that prediction of zones with high potential for slope failure can be more accurate. (c) 2006 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.enggeo.2006.03.002

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  • 2004年新潟県中越地震に伴う地下水温・水質の異常

    佐藤早苗, 氏原英敏, 豊島剛志, 小林健太, 渡部直喜, 大川直樹, 和田幸永, 小河原孝彦, 播磨雄太, 小泉尚嗣

    新潟大学積雪地域災害研究センター研究年報   27号   41 - 56   2005.12

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  • Heavy-rainfall induced landslides on July 13, 2004, Niigata

    Yamagishi H, Watanabe N, Ayalew L, andslide Research, Group of L, slide Society of Japan

    Monitoring, Prediction and Mitigation of Water-Related Disasters MPMD-2005   501 - 506   2005.12

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  • Distribution and Origin of High Na-Cl Concentration Groundwater in Landslide Mass, at Higashi-kubiki Area, Niigata, Japan Reviewed

    FURUYA Gen, WATANABE Naoki, KOMATSUBARA Takeshi, SATO Osamu, MARUI Hideaki

    Journal of the Japan Society of Engineering Geology   45 ( 6 )   281 - 290   2005.12

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Engineering Geology  

    Na-Cl type groundwaters of high concentration have been often found at landslides in the Higashi-kubiki area, including the Utsunomata landslide, in Niigata Prefecture, Japan. The well loggings were carried out to profile the electric conductivity of groundwater in the landslide mass, and simultaneously groundwater samples were collected for the chemical analysis and the determination of oxygen isotopic ratio. The groundwater profiles in the active landslide mass showed the drastic increase of the electric conductivity around the depth of sliding surface. Such a feature is similar to the chemocline. On the other hand, in the inactive landslide mass, no significant variation was recognized in the profile. Groundwater collected from shallow to deep layer in the landslide mass were chemically classified into following four types in descending order : (1)Ca-HCO_3 and Na, Ca-HCO_3, (2)Na-SO_4, (3)Na-HCO_3, and (4)Na-Cl. Considering the relationship between the oxygen isotope ratio and chloride concentration, Na-Cl type groundwater were formed by the mixing the meteoric water with the altered fossil seawater that underwent a similar diagenesis to the the Nishiyama formation. These groundwater suggest that the deep fossil seawater as an abnormally pressured hydrothermal fluid ascend through the fault fractures and inject the landslide mass.

    DOI： 10.5110/jjseg.45.281

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  • 新潟県中越地震による土砂災害と融雪後の土砂移動状況の変化 Reviewed

    川邉洋, 権田豊, 丸井英明, 渡部直喜, 土屋智, 小山内信智, 内田太郎, 栗原淳一, 中村良光, 井上公夫, 小川紀一朗, 小野田敏

    砂防学会誌   58 ( 3 )   44 - 50   2005.9

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    DOI： 10.11475/sabo1973.58.3_44

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  • 新潟県中越地震における地震断層と地表変状の構造地質学的調査

    豊島剛志, 小林健太, 岩下享平, 大塚洋之, 佐藤早苗, 氏原英敏, 大川直樹, 大橋聖和, 和田幸永, 小安孝幸, 小河原孝彦, 山本 亮, 渡部直喜, 立石雅昭, 島津光夫

    新潟県連続災害の検証と復興への視点 新潟大学・中越地震新潟大学調査団   21 - 31   2005.8

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  • 2004 年新潟県中越地震による地下水異常

    佐藤早苗, 氏原英敏, 豊島剛志, 小林健太, 渡部直喜, 大川直樹, 和田幸永, 小河原孝彦, 播磨雄太

    新潟県連続災害の検証と復興への視点 新潟大学・中越地震新潟大学調査団   50 - 56   2005.8

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  • Effect of NaCl solution as pore water on the residual shear strength and index properties of soil from mudstone area Reviewed

    Tuladhar G.R, Marui H, Watanabe N, Tiwari N

    日本地すべり学会誌   42 ( 1 )   1 - 7   2005.5

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    DOI： 10.3313/jls.42.1

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  • 2004年新潟県中越地震による土砂災害(速報) Reviewed

    川邉洋, 権田豊, 丸井英明, 渡部直喜, 土屋智, 北原曜, 小山内信智, 笹原克夫, 中村良光, 井上公夫, 小川紀一朗, 小野田敏

    砂防学会誌   57 ( 5 )   39 - 46   2005.3

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

    DOI： 10.11475/sabo1973.57.5_39

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  • Hydrogeochemistry and environmental oxygen isotopes of groundwaters from the Muikamachi Basin,Niigata Prefecture Reviewed

    Cheibany O.E, Watanabe N

    水文・水資源学会誌   18 ( 2 )   140 - 155   2005.3

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  • Chemical weathering and the occurrence of large-scale landslides in the Hime River Basin, central Japan Reviewed

    N Watanabe, N Yonekura, W Sagara, OE Cheibany, H Marui, G Furuya

    LandSlides: Risk Analysis and Sustainable Disaster Management   165 - 171   2005

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    The Hime River Basin is located in the northern part of Central Japan and is known as one of the areas where both erosional potential and sediment yield are extremely high in Japan. Landslides and debris flows triggered mainly by heavy rainfalls have frequently occurred in the basin. We have estimated the chemical weathering rates for nineteen watersheds in the Shirouma-Oike Volcano located in the western part of the basin. These rates have been simply estimated by the mass balance equation between solute fluxes of stream waters from each watershed and solute loss comparing fresh and weathered volcanic rocks and were calculated to be ranging from 0.15 to 3.24 mm yr(-1). A watershed showing the highest rate of chemical weathering and solute flux corresponded to the area where the large-scale landslide occurred in 1911 and debris flows and landslides have continually occurred until now. Unstable sediments yielded by chemical weathering are thought to be an important factor of sediment disaster occurrences in the research area. Solute fluxes of each stream could be useful for susceptibility mappings of landslides and debris flows in each watershed.
    A cause of the high chemical weathering rate is the leaching of soluble elements from fresh bedrocks with sulfuric acid produced by the oxidation of pyrite in altered rocks by previous hydrothermal activities. Stream waters from the altered zones are characterized by high SO4/Cl ratio. Such a simple hydrochemical signature could also be useful for detection of hydrothermally altered zones covered with vegetation and thick soil layers.

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  • 新潟県中越地震により発生した斜面災害

    丸井英明, 吉松弘行, 渡部直喜

    新潟大学積雪地域災害研究センター研究年報   26号   79 - 86   2004.12

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  • Landslide susceptibility mapping using a semi-quantitative approach, a case study from Kakuda-Yahiko Mountains, Niigata, Japan Reviewed

    Ayalew L, Watanabe N, Marui H, Yamagishi H

    Proceedings of the 4th Asian Symposium on Engineering Geology and the Environment, Hong kong, China   99 - 106   2004.12

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  • Debris disasters caused by local heavy rainfall in Niigata area in July 2004 (prompt report) Reviewed

    MARUI Hideaki, WATANABE Naoki, KAWABE Hiroshi, GONDA Yutaka, IRASAWA Michiya, SASAHARA Katsuo, NAKAMURA Yoshimitsu, YASUDA Yuji

    Journal of the Japan Society of Erosion Control Engineering   57 ( 3 )   53 - 59   2004.9

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    DOI： 10.11475/sabo1973.57.3_53

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  • 信濃川地震帯の地熱水について(予報) Invited

    渡部直喜, 小松原岳史, ウルドゥ・エレミン=シェイバニ, 中川勉

    (財)環境地質科学研究所研究年報   13号 ( 13 )   29 - 42   2002.4

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  • Carbon and Oxygen isotopes determination for carbonate samples at Research Institute for Hazards in Snowy Area, Niigata University

    MIYAZAKI Takashi, IKAWA Toshiyuki, WATANABE Naoki

    Annual report of the Research Institute for Hazards in Snowy Area, Niigata University   23 ( 23 )   27 - 34   2001.12

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  • Engineering properties of the soil around Nishiyama and Kompirayama after the eruption at Mount Usu in 2000

    Tiwari B, Marui H, Sato O, Yamagishi H, Watanabe N, Furuya G, Suzuki K, Inaba K, Shimura K, Yamazaki F

    新潟大学積雪地域災害研究センター研究年報   23 ( 23 )   63 - 76   2001.12

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  • Damage assesment after the eruption of Mount Usu in 2000

    Tiwari B, Marui H, Sato O, Yamagishi H, Watanabe N, Furuya G, Suzuki K, Inaba K, Shimura K, Yamazaki F

    新潟大学積雪地域災害研究センター研究年報   ( 23 )   77 - 84   2001.12

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  • Process of Slide to Flow in the Gamahara Torrent Debris Flow Reviewed

    Marui H, Watanabe N

    Proceedings of Conference on Transition from Slide to Flow－Mechanisms and Remedial Measures－   157 - 166   2001.8

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  • 断層帯近傍における水文地球化学-長野県野沢温泉周辺の例- Invited

    渡部直喜, 佐藤秀之, 柚原雅樹, ウルドゥ・エレミン=シェイバニ

    (財)環境地質科学研究所研究年報   ( 12 )   71 - 80   2001.4

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  • 新潟県東頸城地域の新第三紀層地すべり泥岩の化学風化作用とせん断強度特性

    児玉貴幸, 渡部直喜, 丸井英明

    新潟大学積雪地域災害研究センター研究年報   ( 22 )   17 - 30   2000.12

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  • 新潟県柏崎平野の地下水の温度異常と伏在活断層

    鈴木幸治, 徐 輝竜, 佐藤 修, 渡部直喜

    環境地質科学研究所研究年報   ( 11 )   134 - 140   2000.4

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  • 長野県稗田山崩壊地周辺に分布する岩石および地表水のSr・Nd同位体比組成

    柚原雅樹, 相楽 渉, 高橋俊郎, 渡部直喜, 山岸宏光, 丸井英明

    新潟大学積雪地域災害研究センター研究年報   ( 21 )   73 - 82   1999.12

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  • 新潟における降水のSrおよび酸素同位体比

    柚原雅樹, 渡部直喜

    新潟大学積雪地域災害研究センター研究年報   ( 21 )   119 - 124   1999.12

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  • 新潟県五頭山西麓の湧水と水文地質構造について

    中川 勉, 渡部直喜, 柚原雅樹, 徐 輝竜

    新潟大学積雪地域災害研究センター研究年報   ( 21 )   83 - 95   1999.12

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  • 五頭山地および笹神丘陵の天然水および岩石のSr同位体比組成

    柚原雅樹, 渡部直喜, 中川 勉, 厨川亮子, 高橋俊郎

    新潟大学積雪地域災害研究センター研究年報   ( 21 )   83 - 95   1999.12

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  • 新潟平野北部と十日町盆地の地下水の温度異常と伏在活断層

    鈴木幸治, 徐 輝竜, 佐藤 修, 渡部直喜, 富樫直人

    産業地質科学研究所研究年報   ( 10 )   32 - 39   1999.4

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  • Hydrogeological Structure and Faults in the Western part of the Gozu Granitic Mass, Niigata Prefecture

    WATANABE Naoki, NAKAGAWA Tsutomu, YUHARA Masaki

    Annual Meeting of the Geological Society of Japan   1999   106 - 106   1999

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    DOI： 10.14863/geosocabst.1999.0_106_1

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  • 沖見地すべり流域における地下水流出特性の解析

    羅 暁林, 丸井英明, 佐藤 修, 渡部直喜

    新潟大学積雪地域災害研究センター研究年報   ( 20 )   62 - 80   1998.12

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  • 1997年八幡平土石流と地質・土質並びに水質特性

    丸井英明, 渡部直喜

    新潟大学積雪地域災害研究センター研究年報   ( 20 )   10 - 24   1998.12

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  • 新潟大学積雪地域災害研究センターにおける水試料の酸素同位体比測定

    渡部直喜, 柚原雅樹, 佐藤 修, 鈴木将之, 中川 勉

    新潟大学積雪地域災害研究センター研究年報   ( 20 )   105 - 110   1998.12

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  • 天然水試料のSr同位体測定

    柚原雅樹, 渡部直喜, 加々美寛雄, 中沢健太, 中川 勉

    新潟大学積雪地域災害研究センター研究年報   ( 20 )   56 - 61   1998.12

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  • 蒲原沢源頭部崩壊地付近の地下水の挙動について

    丸井英明, 渡部直喜, 佐藤一幸, 吉川正徳, 南雲政博, 外山裕一

    新潟大学積雪地域災害研究センター研究年報   ( 20 )   1 - 9   1998.12

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  • 新潟県の歴史被害地震と伏在活断層について

    大木靖衛, 徐 輝竜, 河内一男, 鈴木幸治, 渡部直喜, 佐藤 修

    産業地質科学研究所研究年報   ( 9 )   21 - 39   1998.4

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  • Generation of brittle fault in the Gozu granitic mass, niigata pref., NE Japan

    TAKAHASHI Miho, KOBAYASHI Kenta, TOYOSHIMA Tsuyoshi, WATABE Naoki, KURIYAGAWA Ryoko

    Annual Meeting of the Geological Society of Japan   1998   P067   1998

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    DOI： 10.14863/geosocabst.1998.0_P067

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  • "Exotic" Groundwaters from Large-scale Landslides

    WATANABE Naoki, FUJITA Hiroyuki, SUZUKI Koji, SATO Osamu

    Annual Meeting of the Geological Society of Japan   1998   607 - 607   1998

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    DOI： 10.14863/geosocabst.1998.0_607

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  • An Example of Landslide Triggered Debris Flow －The Gamahara Torrent Debris Flow of 6 December 1996, Japan－

    Marui H, Watanabe N, SATO O

    International Symposium on Natural Disaster Prediction and Mitigation, December 1-5, 1997, Kyoto, Japan   345 - 350   1997.12

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  • 蒲原沢土石流災害について

    丸井英明, 渡部直喜, 佐藤 修, 前川峰志

    新潟大学積雪地域災害研究センター研究年報   ( 19 )   23 - 48   1997.12

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  • Chemical Weathering of andesitic rocks at the Hieda-yama landslidearea, Nagano Prefecture

    Wataru SAGARA, Naoki WATANABE, Osamu SATO

    Annual report of the Research Institute for Hazards in Snowy Area, Niigata University   19 ( 19 )   83 - 96   1997.12

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  • 蒲原沢土石流の発生に関与した地下水 Invited

    佐藤 修, 渡部直喜, 相楽 渉, 丸井英明

    月刊地球   19 ( 10 )   634 - 639   1997.10

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  • 平成7年姫川土砂災害と平成8年12月6日蒲原沢土石流災害 Invited

    丸井英明, 渡部直喜

    月刊地球   19 ( 10 )   606 - 611   1997.10

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  • Preliminary Report on Gamahara Torrent Debris Flow on 6 December 1996, Japan Reviewed

    Marui H, Sato O, Watanabe N

    Journal of Natural Disaster Science   18 ( 2 )   89 - 98   1997.7

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  • Gamahara Torrent Debris Flow on 6 December 1996, Japan Reviewed

    Marui H, Watanabe N, Sato O, Fukuoka H

    Landslide News   ( 10 )   4 - 6   1997.7

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  • Deep Groundwaters in the Tertiary Type Landslides Reviewed

    WATANABE Naoki, SHIRAISHI Shuichi, SATO Hisanori, SATO Osamu

    45 ( 6 )   32 - 34   1997.6

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  • 12.6新潟・長野県境蒲原沢土石流災害緊急報告 Invited

    丸井英明, 佐藤 修, 渡部直喜

    新潟応用地質研究会誌   47 ( 47 )   57 - 62   1997.3

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  • A debris flow disaster in the Gamahara tributary of the Hime river on December 6,1996

    Watanabe Naoki, Marui Hideaki, Sato Osamu

    Journal of the Geological Society of Japan   103 ( 1 )   III - IV   1997.1

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    DOI： 10.5575/geosoc.103.III

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  • 平成8年12月6日新潟・長野県境蒲原沢土石流災害（速報) Reviewed

    丸井英明, 佐藤修, 渡部直喜

    砂防学会誌   49 ( 5 )   60 - 62   1997.1

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  • Debris Avalanches and Debris Flows in Urakawa River Basin

    Hideaki MARUI, Osamu SATO, Naoki WATANABE

    Annual report of the Research Institute for Hazards in Snowy Area, Niigata University   18 ( 18 )   43 - 70   1996.12

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  • 新潟県松之山地すべり地のNa-Cl型地下水の起源

    渡部直喜, 大木靖衛, 佐藤 修, 日下部 実

    新潟大学積雪地域災害研究センター研究年報   18 ( 18 )   81 - 92   1996.12

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  • Preriminary report of Hydrological Investigation in Okimi Landslide,

    Osamu SATO, Hideaki MARUI, Naoki WATANABE

    Annual report of the Research Institute for Hazards in Snowy Area, Niigata University   18 ( 18 )   33 - 42   1996.12

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  • 1995 Northern Niigata Earthquake of M6.0 Reviewed

    OKI Yasue, HUILONG Xu, WATANABE Naoki, SUZUKI Kouji, SATO Osamu, KAWAUCHI Kazuo

    The Quat. Res.   35 ( 3 )   153 - 163   1996.5

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    A destructive earthquake of magnitude 6 on the Richter scale occurred 18km east of Niigata in the flat paddy fields of the Niigata Plain on April 1, 1995. The epicenter was so shallow, at a depth of 10km, that 55 houses completely collapsed and 165 partially collapsed, but no one died. The distribution of seismic itensity was analyzed by the moment calculated for overturned prismatic gravestones. Vertical acceleration at the epicenter was calculated to be larger than the acceleration of gravity. A rating of intensity 6 on the scale of the Japan Meteorological Agency was recorded in an area of 5.2×1km trending NNE-SSW, which may indicate the distribution of the buried ruptured fault beneath the plain. This destructive earthquake occurred at the eastern margin of the seismic gap, in an area which might spawn a strong destructive earthquake soon, as indicated by Mogi (1988), Ishikawa (1990, 1994) and Ohtake (1994). Special measures for the prevention of earthquake disaster should be established in the Niigata area, soon.

    DOI： 10.4116/jaqua.35.153

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  • 471 1995 Northern Niigata Earthquake of M 6.0 and a Buried Fault Imaged by Distribution of Seismic Intensity and groundwater temperature

    XU Huilong, OKI Yasue, WATANABE Naoki, SUZUKI Kouji, SATO Osamu

    Annual Meeting of the Geological Society of Japan   1996   337 - 337   1996

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    DOI： 10.14863/geosocabst.1996.0_337_1

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  • 472 Buried Faults Imaged by Distribution of Groundwater Temperature in the Muikamachi Basin, Niigata Prefecture

    WATANABE Naoki, XU Huilong, TAKEUCHI Jinya, OKI Yasue

    Annual Meeting of the Geological Society of Japan   1996   337 - 337   1996

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    DOI： 10.14863/geosocabst.1996.0_337_2

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  • 1995年新潟県北部地震の震度分布と伏在活断層について Invited

    大木靖衛, 徐輝竜, 渡部直喜, 鈴木幸治, 佐藤修

    月刊地球   17 ( 12 )   766 - 773   1995.12

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  • 1995 northern Niigata earthquake of M6.0 and a buried fault imaged by distribution of seismic intensity

    Oki Y, Xu H, Watanabe N, Suzuki K, Sato O

    新潟大学積雪地域災害研究センター研究年報   17 ( 17 )   69 - 82   1995.12

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  • High field strength element depletions in the lithospheric mantle beneath the Northeast Japan arc Reviewed

    Shuto Kenji, Nakajima Seiko, Ohki Jun'ichi, Uematsu Masakatsu, Watanabe Naoki, Yamamoto Kazuhiro

    The Memoirs of the Geological Society of Japan.   ( 44 )   241 - 262   1995.10

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    On the basis of Sr and Nd isotopic data for Tertiary and Quaternary volcanic rocks from the NE Japan arc, two isotopically different mantle source have been proposed by several workers. One is an undepleted sub-island arc upper mantle from which ～35 Ma to～15 Ma basaltic magmas in the back-arc side and ～21 Ma to the present basalts in the trench side and transitional zone were extracted. The other is depleted asthenosphere which upwelled and intruded the undepleted sub-island arc upper mantle beneath the back-arc side of the NE Japan arc at around 15 Ma. The temporal change in HFS element (high field strength element) character of two different parts of the mantle beneath the NE Japan arc was investigated using Nb, Ti, Y and Zr in 103 basaltic samples (MgO≧5%, SiO_2≦53%) from the trench side (including some samples from the transitional zone) and 127 samples from the back-arc side. Systematic differences are observed in the HFS element contents of oder basalts relative to younger ones. Basaltic rocks derived from the sub-island arc upper mantle exhibit a gradual decrease in Zr/Y and a gradual increase in Ti/Zr with decreasing age from ～35 Ma to the present, whereas those from the up welled asthenospheric mantle show different HFS element variations with decreasing age from ～15 Ma to the present. Basalts with the lowest Zr/Y ratios have been plotted on the 2Nb-Zr/4-Y diagram of Meschede (1986), which shows that the sub-island arc upper mantle of the NE Japan arc has gradually changed its HFS element character from a highly in compatible HFS element-enriched OIB source, to an N-MORB source, to a highly in compatible HFS element-depleted IAB source, with decreasing in age. The gradual depletion in HFS elements with greater in compatibility in the sub-island arc upper mantle may be due to the successive extraction of basaltic magmas from the source since ～35 Ma ago. On Meschede's (1986) diagram basalts derived from the upwelled asthenospheric mantle show a change in the source from slightly depleted in Zr and slightly enriched in Nb compared to N-MORB, to a source slightly depleted both in Zr and Nb compared to N-MORB during the last 15 Ma. Variations of Ti/Zr and Zr/Nb ratios of basaltic rocks from the NE Japan arc are not compatible with the presence of residual sphene, rutile and amphibole in the source mantle, which would partition Ti and Nb.

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  • 新潟県松之山地すべり地域の地下水の水質について Reviewed

    渡部直喜, 鷲津史也, 大木靖衛, 佐藤修

    日本地すべり学会誌   32 ( 2 )   32 - 40   1995.7

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    DOI： 10.3313/jls1964.32.3_32

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  • Geochemistry of groundwaters in the Matsunoyama landslides, Niigata Prefecture

    Naoki Watanabe

    PhD Thesis of Niigata University   1995.3

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  • 85. Landside Generations by Geopressured Hydrothermal Systems and Neo-tectonic Implication

    WATANABE Naoki, OKI Yasue, TATO Osamu

    Annual Meeting of the Geological Society of Japan   1995   120 - 120   1995

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    DOI： 10.14863/geosocabst.1995.0_120_1

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  • 1992 Tsunan Earthquake of M4.5, Southern Niigata Prefecture

    Yasue OKI, Osamu SATO, Shigeru AOKI

    Annual report of the Research Institute for Hazards in Snowy Area, Niigata University   16 ( 16 )   1 - 36   1994.12

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  • 448. A Stable Isotopic Study of Groundwaters from the Matsunoyama Landslide Area in Niigata Prefecture.

    WATANABE Naoki, OKI Yasue, SATO Osamu, KUSAKABE Minoru

    Annual Meeting of the Geological Society of Japan   1994   286 - 286   1994

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    DOI： 10.14863/geosocabst.1994.0_286_2

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  • K-Ar ages of volcanic rocks from the Tomari Area in the Shimokita Peninsula, Northeast Japan Arc. Reviewed

    Watanabe N, Takimoto T, Shuto K, Itaya T

    Journal of Mineralogy, Petrology and Economic Geology   88 ( 7 )   352 - 358   1993.7

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    DOI： 10.2465/ganko.88.352

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  • 陸弧火山活動から島弧火山活動へ−東北日本弧第三紀火山活動の時間変遷− Invited

    周藤賢治, 大木淳一, 山本和広, 渡部直喜

    地質ニュース   464 ( 464 )   6 - 18   1993.6

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  • K-Ar ages of Miocene Ryozen basalts from the northern margin of the Abukuma Highland, Japan Reviewed

    Ohki J, Shuto K, Watanabe N, Itaya T

    Journal of Mineralogy, Petrology and Economic Geology   88 ( 6 )   313 - 319   1993.6

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    DOI： 10.2465/ganko.88.313

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  • Shifting of the volcanic fronts during Early to Late Miocene in the Northeast Japan arc Reviewed

    Jun'ichi Ohki, Naoki Watanabe, Kenji Shuto, Tetsumaru Itaya

    Island Arc   2 ( 2 )   87 - 93   1993

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    Abstract Recent advanced chronological studies for the Tertiary volcanic rocks from the Northeast (NE) Japan arc revealed three volcanic fronts which differed in temporal and spatial distribution. These fronts were (i) the Matsumae‐Shizukuishi‐Shiogama line of 22–25 Ma which is obliquely across the Quaternary volcanic front (QVF)
    (ii) the Tomari‐Shiogama line of 13–16 Ma which exists 30–50 km east of the QVF and (iii) a line of 0–8 Ma which is the same as the QVF. The first shifting of the 22–25 Ma line to the 13–16 Ma one was due to the counterclockwise rotation of the NE Japan arc during 20–12 Ma as proposed by Otofuji et al. (1985), and the second shifting of the 13–16 Ma line to the 0–8 Ma line could have contributed to a decrease in the dip of the slab of the Pacific plate which subducted beneath the NE Japan arc during 13–8 Ma. Copyright © 1993, Wiley Blackwell. All rights reserved

    DOI： 10.1111/j.1440-1738.1993.tb00076.x

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  • THE RELATIONSHIPS BETWEEN DRASTIC CHANGES IN SR ISOTOPE RATIOS OF MAGMA SOURCES BENEATH THE NE JAPAN ARC AND THE SPREADING OF THE JAPAN SEA BACK-ARC BASIN Reviewed

    K SHUTO, J OHKI, H KAGAMI, M YAMAMOTO, N WATANABE, K YAMAMOTO, N ANZAI, T ITAYA

    MINERALOGY AND PETROLOGY   49 ( 1-2 )   71 - 90   1993

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    Based on Sr isotopic data for Tertiary and Quaternary basaltic rocks from the NE Japan arc, relationships are discussed between the temporal variation of magma source characteristics and the opening of the Japan Sea. The basaltic rocks from the trench side and from the transitional zone show initial Sr-87/Sr-86 ratios (Sr(i) ratios) in the range of 0.70411-0.70546 but no temporal variation in Sr(i) ratios. The back-arc side basaltic rocks with ages of 29.8 to almost-equal-to 15 Ma have Sr(i) ratios similar to those of the trench side and the transitional zone, and these values also show no temporal change. In contrast, the basaltic rocks from the back-arc side, with ages younger than almost-equal-to 15 Ma, show significantly lower Sr(i) ratios (0.70396 to 0.70290), which are slightly higher than those of N-type MORB. These Sr isotopic features may imply that at least before almost-equal-to 15 Ma the magma source regions (the sub-continental mantle) beneath the NE Japan arc had an enriched chemical character and that after almost-equal-to 15 Ma, the magma sources for volcanic rocks from the back-arc side show a drastic change in Sr isotopic character, from an enriched nature to a depleted one. The depleted magmas may have been formed as a result of injection of depleted asthenosphere (or of a depleted mantle diapir) into the subcontinental mantle under the back-arc side of the NE Japan arc, during the spreading of the Japan Sea back-arc basin. The middle Miocene basaltic rocks from the back-arc side are characterized by lower contents of LIL elements such as K2O and Rb compared with those from the trench side, suggesting that during the middle Miocene (syn-opening stage of the Japan Sea) the degree of partial melting may have been higher in the back-arc side mantle than in the trench side mantle. High degree of partial melting in the back-arc side mantle can be attributed to an increasing geothermal gradient in the mantle due to the injection of hot asthenosphere. This injection might also have caused the melting of the lower crust from which the voluminous middle Miocene acidic volcanics in the back-arc side and transitional zone may have been produced.

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  • 東北日本弧の中期中新世（16～12Ma）火山活動とテクトニクス Invited

    周藤賢治, 大木淳一, 渡部直喜, 安斎憲夫, 山本和広, 牧野淳史, 猪俣恵理, 滝本俊明, 桑原通泰, 板谷徹丸

    松本征夫教授退官記念論文集   333 - 346   1992.4

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  • 蛍光Ｘ線分析装置による珪酸塩岩石中のBa，Co，Cr，Vの定量分析

    川野良信, 渡部直喜, 山本和広, 周藤賢治

    新潟大学理学部地質鉱物教室研究報告   ( 7 )   111 - 115   1992.3

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  • Large Scale Landslides Generated by Geopressured Hydrothermal System in Matsunoyama, Niigata Prefecture

    OKI Yasue, WASHIZU Fuminari, SATO Osamu, WATANABE Naoki

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN   1992   99 - 99   1992

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    DOI： 10.18940/vsj.1992.2.0_99

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  • 奥尻島の第三紀火山岩のＫ−Ａｒ年代と東北日本弧周辺の漸新世および前期中新世火山岩の岩石学的特徴 Reviewed

    山本和広, 周藤賢治, 渡部直喜, 板谷徹丸, 加々美寛雄

    日本岩石鉱物鉱床学会誌   86 ( 11 )   507 - 521   1991.11

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    DOI： 10.2465/ganko.86.507

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  • Petrology of Asakusa Volcano Reviewed

    Asakusa Volcano Collaborative Research Group

    Earth Science (Chikyu Kagaku)   45 ( 2 )   113 - 130   1991.3

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    The rocks from Asakusa volcano, Northeast Japan, are described, and the representative 76 samples were chemically analyzed. Asakusa Volcano Collaborative Research Group (1991) divided the geologic history of the volcano into main two stages, early and late stages. The late stage activity formed the principal edifice of the volcano and is further subdivided into four stages. The rocks of the volcano are composed mostly of the rock suites ranging from basalt to andesite with minor amounts of dacite and all the samples are porphyritic with 20-50 vol. % of phenocrysts. The early stage rocks are composed of andesite of Kuno's (1950) hypersthenic rock series (H series), containing phenocrysts of hornblende together with pyroxene. The rock suite of the first stage consists mainly of andesite and basalt, belonging to both Kuno's pigeonitic rock series (P series) and H series, with minor amounts of dacite of H series. Hornblende phenocrysts are also found in the dacite. The second stage volcanic products are composed largely of andesite and basalt, corresponding to both P and H series. Hornblende phenocrysts are present in andesite erupted in the early period of this stage, but phenocrystic hydrous minerals are absent in one formed in the late period. The volcanic products of both the third and fourth stages are made up basalt and andesite without phenocrystic hydrous minerals. They are of both P and H series. The major and trace element chemical characteristics of the rocks from Asakusa volcano are as follows: 1) In the FeO^*/MgO-SiO_2 diagram, the rocks of each stage mostly plot in the field of the tholeiitic series regardless of P or H series and represent similar differentiation trend. 2) They generally plot on around the boundary between the two fields of the low-alkalitholeiite and high-alkalitholeiite series by Kuno (1968) in total alkalies vs. SiO_2 diagram. 3) All of the rocks also plot in the midway region of the field of Gill's (1981) medium-K andesites and its extention in K_2O vs. SiO_2 diagram. 4) The basaltic rocks from the volcano show the incompatible element characteristics typical of island are basalts, indicating the positive Rb, K and Rb anomalies and the negative Zr, Ti and Y anomalies on the N-type MORE normalized pattern for incompatible elements. Although Asakusa volcano is situated in the Moriyoshi volcanic zone, the volcano has the petrographical and chemical characteristics similar to those of both Moriyoshi and Chokai volcanoes according to the comparative examination of LIL element compositions (Na_2O+K_2O, K_2O, Rb, Sr) and petrography among three volcanoes.

    DOI： 10.15080/agcjchikyukagaku.45.2_113

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  • Geology of Asakusa Volcano Reviewed

    Asakusa Volcano Collaborative Research Group

    Earth Science (Chikyu Kagaku)   45 ( 2 )   101 - 112   1991.3

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    Geological study on Asakusa volcano located on the southern part of Moriyoshi volcanic zone in the Northeast Japan arc has been carried out to construct the volcanic history. The volcano had been active in the middle Pleistocene age arid ejected about 6km^3 of the volcanic materials. Volcariism of this volcano began with eruption of minor amounts of lava flows (early stage lava flows), followed by development of the principal constituents of the volcano. The volcanic history of its principal constituents is summarized as follows. Stage 1: Major lava flows and associated pyroclastic flows erupted from a central vent to form a cone-shaped stratovolcano. The estimated volume of the volcanic product is about 2.5km^3. The rocks are composed mainly of andesite and basalt, with augite, hypersthene and sometimes olivine phenocrysts, which is accompanied by a small amount of dacite with phenocrysts of hornblende, augite and hypersthene. Stage II: Central eruption of large amounts of pyroclastic flows and subordinate lava flows also occurred and the stratovolcano built by the first stage volcanism was further grown. The volume of the volcanic edifice is estimated to be about 3 km^3. Andesite with phenocrysts of hornblende, hypersthene and augite was erupted in the early period of this stage, which was followed by eruptions of pyroxene-olivine basalt and pyroxene andesite. The central vents were situated in the uppermost stream of the Tadamizawa Valley throughout the first to second stage. Stage III: After completion of the stratovolcano, small eruptions of lavas composed largely of olivine bearing pyroxene basalt and andesite, and pyroxene andesite occurred from several vents and these lava flows covered the northern and southern flanks of the volcano. Stage IV: Small eruptions of lava flows and pyroclastic flows occurred and their products mainly covered the northern flank. The erupted materials are basalt and andesite containing phenocryst minerals same as those of the rocks in Stage III. Total volume of the volcanic edifice in Stages III and IV amounted roughly to 0.5km^3.

    DOI： 10.15080/agcjchikyukagaku.45.2_101

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  • 247 Petrology of Tappi Volcanic Rocks, Tsugaru Peninsula.

    WATANABE Naoki

    Annual Meeting of the Geological Society of Japan   1991   376 - 376   1991

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    DOI： 10.14863/geosocabst.1991.0_376

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  • 41 Miocene volcanism and K-Ar ages in Tappi area of the Tsugaru Peninsula

    Watanabe Naoki, Itaya Tetsumaru

    Annual Meeting of the Geological Society of Japan   1990   172 - 172   1990

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    DOI： 10.14863/geosocabst.1990.0_172

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  • 図説日本の温泉 : 170温泉のサイエンス

    日本温泉科学会（ Role： Contributor）

    朝倉書店  2020.3  （ ISBN:9784254160758 ）

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    Total pages：ix, 194p, 図版 [4] p   Language：Japanese

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  • 地形の辞典

    日本地形学連合, 鈴木 隆介, 砂村 継夫, 松倉 公憲, 渡部 直喜（ Role： Contributor）

    朝倉書店  2017.2  （ ISBN:9784254160635 ）

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  • 温泉と地球科学～温泉を通して読み解く地球の営み

    日本温泉科学会, 大沢 信二, 西村 進, 渡部 直喜（ Role： Contributor）

    ナカニシヤ出版  2016.9  （ ISBN:9784779510946 ）

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  • 地震災害への備えを考える—中越地震・中越沖地震で学んだこと—

    伊藤 忠雄, 渡部 直喜（ Role： Contributor）

    新潟日報事業社  2009.10  （ ISBN:9784861323638 ）

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  • 廃棄物再生資材による自然由来重金属類含有土壌の不溶化特性評価

    斎藤健志, 川辺能成, 渡部直喜

    環境工学研究フォーラム講演集(CD-ROM)   60th   2023

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  • Multivariate analysis for hydrochemical data Reviewed

    Naoki WATANABE

    Journal of the Japan Landslide Society   59 ( 6 )   265 - 268   2022.11

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    DOI： 10.3313/jls.59.265

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  • Applicability of waste and recycled materials for neutralization of acidic soils

    斎藤健志, 渡部直喜

    材料とプロセス(CD-ROM)   35 ( 2 )   2022

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  • 同位体水文学－応用編（地すべりキーワード101 (ワン・オー・ワン) －50－） Invited

    渡部直喜

    日本地すべり学会誌   58 ( 6 )   269 - 273   2021.11

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  • 地下水の年代測定（地すべりキーワード101 (ワン・オー・ワン) －47－） Invited

    渡部直喜

    日本地すべり学会誌   58 ( 3 )   141 - 144   2021.5

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  • 同位体水文学－基礎編（地すべりキーワード101 (ワン・オー・ワン) －46－） Invited

    渡部直喜

    日本地すべり学会誌   58 ( 2 )   86 - 89   2021.3

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  • 日本海東縁における新第三系海成層の地すべりの素因

    西山成哲, 西山成哲, 千木良雅弘, 鈴木浩一, 渡部直喜

    地すべりシンポジウム   47th   2019

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  • 日本海側新第三系堆積岩地域における深部高塩濃度地下水と地すべりとの関係

    西山成哲, 千木良雅弘, 鈴木浩一, 渡部直喜

    日本応用地質学会研究発表会講演論文集   2018   2018

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  • 日本海側新第三系堆積岩地域における山地解体過程と深部流体の関係

    西山成哲, 千木良雅弘, 鈴木浩一, 渡部直喜

    日本地球惑星科学連合大会予稿集(Web)   2018   2018

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  • 新第三系の地すべり密集地帯における広域的な地下水の水質分布

    西山成哲, 千木良雅弘, 鈴木浩一, 渡部直喜

    日本応用地質学会研究発表会講演論文集   2017   2017

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  • 新潟県南部の地すべり密集地帯における高塩濃度地下水の分布

    西山成哲, 千木良雅弘, 鈴木浩一, 渡部直喜

    日本地球惑星科学連合大会予稿集(Web)   2017   2017

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  • Outline of landslide disasters caused by destructive earthquake in the northern part of Nagano Prefecture on November 22, 2014

    FURUYA Gen, HATA Toshiro, WATANABE Naoki, GOTO Satoshi, DOI Issei, KAWASAKI Ichiro

    Journal of the Japan Landslide Society   52 ( 1 )   40 - 44   2015

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  • 2012年融雪により発生した新潟県上越市国川地すべりの数値解析的の検討

    王 純祥, 渡部 直喜, 丸井 英明

    新潟大学災害・復興科学研究所年報   3   106 - 107   2014.12

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  • 地すべりダムの形成・破壊機構と決壊危険度評価法に関する研究

    古谷 元, 王 功輝, 若井 明彦, 渡部 直喜, 王 純祥, 丸井 英明

    新潟大学災害・復興科学研究所年報   3   153 - 156   2014.12

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    本研究では，防災・減災面で社会問題化している地すべりダムの形成・破壊機構と決壊危険度評価法について，東竹沢地すべりを事例として物理探査，数値解析，および海外事例との対比より実施した．その結果，地すべりダム堤体の調査に表面波探査と微動アレイ探査の併用が有用であること，土の軟化ひずみ特性を考慮したFEM解析よりダムの形成過程が再現できたこと，そしてErmini and Casagli（2003）の決壊危険度評価より東竹沢地すべりのダム堤体は安定ではないことを示した．

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  • クロアチアザグレブ市後背丘陵地における三次元斜面崩壊予測システムの開発

    王 純祥, 丸井 英明, 渡部 直喜

    新潟大学災害・復興科学研究所年報   2   93 - 94   2013.9

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    Other Link： http://hdl.handle.net/10191/29607

  • 65. Groundwater Formation in the Gosen-Muramatsu Basin, Niigata Prefecture

    Watanabe Naoki, Hayashi Yoshinobu, Shibayama Aya, Funabiki Kazuki

    25   125 - 126   2013

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  • クロアチアのRjecina川流域の土砂災害予測モデルの開発に関する研究

    王 純祥, 丸井 英明, 渡部 直喜

    新潟大学災害・復興科学研究所年報   1   91 - 92   2012.10

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  • Erratum to "Relationship between groundwater flow estimated by soil temperature and slope failures caused by heavy rainfall, Shikoku Island, southwestern Japan" [Engineering Geology 85/3-4 (2006) 332-346]

    Gen Furuya, Akira Suemine, Kyoji Sassa, Takeshi Komatsubara, Naoki Watanabe, Hideaki Marui

    ENGINEERING GEOLOGY   94 ( 1-2 )   122 - 122   2007.10

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    Language：English   Publisher：ELSEVIER SCIENCE BV  

    DOI： 10.1016/j.enggeo.2007.01.011

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  • Landslides in Hijirigahana induced by the Niigataken Chuetsu-oki Earthquake in 2007

    Research Team of the Jpan Landslide Society, Hayakawa Kaichi, Inaba Kazunari, Watanabe Naoki, Nozaki Tamotsu

    44 ( 3 )   45 - 46   2007.9

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  • 空間情報実習室開設について (分野横断的な取り組み)

    山岸 宏光, 卯田 強, 権田 豊, 豊島 剛志, 渡部 直喜, 泉宮 尊司, 阿部 信行, 吉川 夏樹, 牧野 秀夫

    新潟大学災害復興科学センター年報   ( 1 )   49 - 53   2007

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    Other Link： http://hdl.handle.net/10191/5948

  • 防災部門 地域防災計画分野の活動

    丸井 英明, 渡部 直喜, 泉宮 尊司, 豊島 剛志, 権田 豊, 卯田 強

    新潟大学災害復興科学センター年報   ( 1 )   120 - 124   2007

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    Other Link： http://hdl.handle.net/10191/5966

  • 2004年新潟県中越地震震源域周辺における地下水温・水質異常と地下地質構造の関係について

    豊島剛志, 渡部直喜, 小林健太, 佐藤早苗, 氏原英俊, 小泉尚嗣

    地震予知連絡会会報   75   453 - 457   2006.12

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：国土地理院  

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  • 4.1 新潟県中越地震における地震断層と地表変状の構造地質学的調査および地下水変動調査

    豊島剛志, 小林健太, 岩下享平, 大塚洋之, 佐藤早苗, 氏原英敏, 大川直樹, 大橋聖和, 和田幸永, 小安孝幸, 小河原孝彦, 山本 亮, 渡部直喜, 立石雅昭

    科研費報告書   145 - 156   2005.5

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  • Landslide Disasters Caused by The Chuetsu Earthquake on October 23, 2004

    Joint Research Team of The Japan Landslide Society and The Japan Society of Engineering Geology

    Landslides   41 ( 6 )   83 - 86   2005.3

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：The Japan Landslide Society  

    DOI： 10.3313/jls.41.6_651

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    Other Link： https://jlc.jst.go.jp/DN/JALC/00388706174?from=CiNii

  • 新潟県中越地震による山古志村の土砂災害の状況特に芋川流域の地すべりダムについて

    渡部直喜, 丸井英明, 川邉 洋, 権田 豊, 山岸宏光, 稲葉一成

    平成16年新潟県中越地震被害調査報告会梗概集   39 - 46   2004.12

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：日本地震工学会  

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  • 土砂災害研究の現状と展望

    渡部直喜, 丸井英明

    新潟大学積雪地域災害研究センター研究年報   26   17 - 25   2004.12

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher：新潟大学積雪地域災害研究センター  

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  • 7.13新潟豪雨に伴う斜面災害調査報告

    山岸宏光, 丸井英明, 渡部直喜, 澤田雅代, 太田雄三, 鵜川准光, アヤレウ・ルルセゲド, 原田綾乃, 肥塚高之, 南木均, 大谷政敬, 堀田亨, 坂東和郎, 上松昌勝, 高橋亮一, 今井貴人, 岡田正明, 森田明夫, 沼田宗純, 阿部慶太, 井筒剛司

    日本地すべり学会誌   41 ( 3 )   80 - 84   2004.9

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  • Landslide occurred in the Kitanigoro-Jingamine area, Tochio, Niigata Prefecture

    WATANABE Naoki, TAKAHASHI Kozo, HIZUKA Takayuki, MURATA Ryuji, SATO Hisanori

    Journal of the Japan Landslide Society   41 ( 2 )   184 - 185   2004.7

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  • 新潟県栃尾市北荷頃陣ヶ峰地区で発生した地すべり

    渡部直喜, 高橋宏造, 肥塚高之, 村田竜治, 佐藤壽則

    日本地すべり学会誌   41 ( 2 )   80 - 84   2004.7

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：(社)日本地すべり学会  

    DOI： 10.3313/jls.41.184

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  • The observation system of geothermal waters and climate for prediction of volcanic hazards at the foot of the Niigata Yakeyama Volcano

    WATANABE Naoki, IZUMI Kaori, SUZUKI Koji

    Annual report of the Research Institute for Hazards in Snowy Area, Niigata University   23   1 - 7   2001.12

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    Language：Japanese   Publisher：Niigata University  

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    Other Link： http://hdl.handle.net/10191/39233

  • Hydrogeology and hydrochemistry of spring waters from the westemslope of the Gozu mountain in Niigata Prefecture

    Tsutomu NAKAGAWA, Naoki WATANABE, Masaki YUHARA

    Annual report of the Research Institute for Hazards in Snowy Area, Niigata University   21   96 - 107   1999.3

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    Language：Japanese   Publisher：Niigata University  

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    Other Link： http://hdl.handle.net/10191/39205

  • An Introduction to the Penn State Astrobiology Research Center

    Watanabe Naoki

    Annual report of the Research Institute for Hazards in Snowy Area,Niigata University.   ( 21 )   149 - 151   1999

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  • 1995新潟県北部地震について

    大木 靖衛, 渡部 直喜, 鈴木 幸治, 徐 輝竜, 佐藤 修

    新潟応用地質研究会誌   44   43 - 46   1995.7

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    Language：Japanese   Publisher：新潟応用地質研究会  

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  • 465. Jituki-yama Landslide Generated by Geopressured Hydrothermal System

    OKI Yasue, SATO Osamu, WATANABE Naoki, SUZUKI Koji, AOKI Shigeru

    100   695 - 695   1993.3

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    Language：Japanese   Publisher：The Geological Society of Japan  

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Research Projects

  • Unraveling the triggers of earthquake-induced landslides of pyroclastic fall deposits and landsliding prediction

    Grant number：22H01739

    2022.4 - 2025.3

    System name：Grants-in-Aid for Scientific Research

    Research category：Grant-in-Aid for Scientific Research (B)

    Awarding organization：Japan Society for the Promotion of Science

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    Grant amount：\17550000 （ Direct Cost: \13500000 、 Indirect Cost：\4050000 ）

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  • Unraveling the features of landslide movement and the advancement of risk assessment based on dense monitoring of groundwater veins

    Grant number：19H02238

    2019.4 - 2022.3

    System name：Grants-in-Aid for Scientific Research

    Research category：Grant-in-Aid for Scientific Research (B)

    Awarding organization：Japan Society for the Promotion of Science

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    Grant amount：\16640000 （ Direct Cost: \12800000 、 Indirect Cost：\3840000 ）

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  • Exploration of super-ocean : Oxygen and silicon stable isotopes of biogenic silica

    Grant number：18340156

    2006 - 2008

    System name：Grants-in-Aid for Scientific Research

    Research category：Grant-in-Aid for Scientific Research (B)

    Awarding organization：Japan Society for the Promotion of Science

    MATSUOKA Atsushi, WATANABE Naoki

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    Grant amount：\13600000 （ Direct Cost: \11500000 、 Indirect Cost：\2100000 ）

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  • レーザーマイクロプローブによる地質試料のケイ素同位体比測定

    2004.4 - 2006.3

    System name：科学研究費助成事業

    Research category：萌芽研究

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    Grant type：Competitive

    Grant amount：\3500000 （ Direct Cost: \3500000 ）

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  • Estimation of Velocity of Chemical Weathering and Amount of Sediment Production and Evaluation of Danger Degree of Torrents Endangered by Debris Flows.

    Grant number：16310126

    2004 - 2005

    System name：Grants-in-Aid for Scientific Research

    Research category：Grant-in-Aid for Scientific Research (B)

    Awarding organization：Japan Society for the Promotion of Science

    MARUI Hideaki, WATANABE Naoki

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    Grant amount：\6400000 （ Direct Cost: \6400000 ）

    The Hime River Basin is located in the northern part of central Japan and is known as one of the areas where both erosional potential and sediment yield are extremely high in Japan. Landslides and debris flows triggered by mainly heavy rainfalls have frequently occurred in the basin, actually. We have estimated the chemical weathering rates for nineteen watersheds in the Shirouma-Oike Volcano located in the western part of the basin. These rates have been simply estimated by the mass balance equation between solute fluxes of stream waters from each watershed and solute loss comparing fresh and weathered volcanic rocks and were calculated to be ranging from 0.15 to 3.24 mm/yr. A watershed showing the highest rate of chemical weathering and solute flux corresponded to the area where the large-scale landslide occurred in 1911 and debris flows and landslides have continually occurred until now. Unstable sediments yielded by chemical weathering are thought to be an important factor of sediment disaster occurrences in the research area. Solute fluxes of each stream could be useful for susceptibility mappings of landslides and debris flows in each watershed.
    A cause of the high chemical weathering rate is the leaching of soluble elements from fresh bedrocks with sulfuric acid produced by the oxidation of pyrite in altered rocks by previous hydrothermal activities. Stream waters from the altered zones are characterized by high SO_4/Cl ratio. Such a simple hydrochemical signature could be also useful for detection of hydrothermally altered zones covered with vegetation and thick soil layers.

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  • Unified stratigraphy by means of Oxygen isotopes and microfossils for Paleozoic-Mesozoic siliceous deposits

    Grant number：14340148

    2002 - 2004

    System name：Grants-in-Aid for Scientific Research

    Research category：Grant-in-Aid for Scientific Research (B)

    Awarding organization：Japan Society for the Promotion of Science

    MATSUOKA Atsushi, WATANABE Naoki

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    Grant amount：\14400000 （ Direct Cost: \14400000 ）

    This project aims at unifying biostratigraphy by means of microfossils such as radiolarians and Oxygen isotope stratigaphy. The most important agenda for this project was to make up a laser microprobe analyzer composed of a laser unit and Oxygen purification lines. The analyzer has been completed at the end of the project term due to twice moves in connection to the renewal of an old building and the construction of a new building. However, the newly established analyzer is much more useful than originally planed because it produces not only Oxygen isotopes but also Silicon isotopes.
    Oxygen isotopes of deep sea siliceous deposits obtained from the Pacific during ODP Leg 129 were measured by using a laser microprobe analyzer in the Geological Survey of Japan before the analyzer in Niigata University was set up. A preliminary result indicates that Upper Jurassic to Lower Cretaceous stratigraphy by means of Oxygen isotope and radiolaria is successfully unified.
    Radiolarian biostratigraphic and micropaleontologic researches were carried out in the Mino and Chichibu Terranes, Southwest Japan. Scientific results on radiolarian paleontology and stratigraphy came from Southern Tibet in China and the North Palawan Block in the Philippines. Pelagic biogenic siliceous rocks have been collected systematically from Switzerland, Italy and Slovenia in the European Alps. These samples will be used for Oxygen and Silicon isotope measurements in the near future.

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  • Mechanical characteristics of weathered rocks and soils for hazard assessment of slope areas.

    Grant number：11460067

    1999 - 2000

    System name：Grants-in-Aid for Scientific Research

    Research category：Grant-in-Aid for Scientific Research (B).

    Awarding organization：Japan Society for the Promotion of Science

    MARUI Hideaki, YAMAGISHI Hiromitsu, WTANABE Naoki, SATO Osamu

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    Grant amount：\7700000 （ Direct Cost: \7700000 ）

    Followings are conclusive summary of our investigation.
    (1)Many tertiary type landslides are distributed in the Higashikubiki area, Niigata Prefecture. Frequency of landslide occurrences in this area is related to the bedrock geology. Several non-weathered and weathered mudstone samples were collected from landslide areas distributed in Teradomari, Shiiya and Nishiyama geologic formations. Simple and ring shear tests were carried out on these samples. Weathered mudstone samples exhibited higher shear strength than non-weathered mudstone samples. Such phenomenon might depend on the changes of shear resistance of the slip surface of landslides caused by alteration of minerals during chemical weathering.
    (2)Triaxial compression test and ring shear test were carried out on clay samples of sliding surfaces in Tertiary type landslides and crystalline schist landslides. Angles of internal friction of residual shear strengths of these samples range from 5 to 30 degree. Their angles of samples from Tertiary landslides are less approximately 10degree than those of samples from crystalline schist landslides. This fact is concordant with difference of slopes between the two type landslides. Mg content of clay samples is reduced through chemical weathering, ferric and aluminum components are residua relatively increase. Swelling minerals such as chlorite and smectite are closely connected to the lowering shear resistance of clay of sliding surface.
    (3)Landslide movements are controlled by bedrock geology and characteristics of soils, and produce unique topographic features. Landslides for once are similar in shape. Creeping landslides, in contrast, are morphologically characterized by aggregates of various partial slumps. Slopes of landslides distributed in Tertiary sediments show less than 30 degree. Slopes of them, in particular, show around 18 degree in mudstone area. Landslides distributed in volcanics show more than 30 degree of slope and their movements are similar to rock slide or rock avalanche.
    (4)Slopes of landslides distributed in crystalline schist and in Tertiary sediment range from 15 to 35 degree and from 10 to 20 degree, respectively. Sizes of landslides such as length, width and area in Tertiary sediments are larger than those in crystalline schist. The depth of sliding surfaces of landslides in Tertiary sediments, however, is shallower than those in crystalline schist.
    Groundwater tables in landslides in Tertiary sediments are generally shallow and close to surface. On the other hand, many landslides in crystalline schist have deeper groundwater tables than their sliding surfaces.

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  • Improvement of micro-earthquake monitoring method in large scale landslides in snowy areas

    Grant number：07554019

    1995 - 1996

    System name：Grants-in-Aid for Scientific Research

    Research category：Grant-in-Aid for Scientific Research (A)

    Awarding organization：Japan Society for the Promotion of Science

    OKI Yasue, TAKAMIZAWA Kaihei, WATANABE Naoki, SATOU Osamu

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    Grant amount：\16100000 （ Direct Cost: \16100000 ）

    Monitoring of seismic activity in snowy area in winter should be done at easily accessible sites close to roads which are always open by snow removing operation. The noise at sites far away from snow removed roade is very quite, however, no body can easily be access seismograph due to thick snow blanket to collect seismic records as well as the maintenance of the equipments. The seismograph have to set at noisy site, which is close to roade always opened by snow removing operation. This is a motivation to develop a noise eliminator equipped seismograph.
    Two same pickups are linearly arranged perpendicular to a noisy road. As the absorption of wave amplitude is very large in terms of distance, the difference of wave signals between two pickups is considerably large when the noise source is close to the monitoring sites. Distances from real earthquake are almost same for two pickups installed at monitoring site. Based on the above principle, a seismograph named as STR-110 equipped with two pickups and a micro computer circuit working for nose selector is developed. Waves recorded by the seismograph are treated by a computer program named MCD to select seismic waves from noises. MCD program is developed by the Fourier analysis of seismic waves and noise waves.
    Using newly developed STR-110 with MCD program, 74 evens consist of 24 earthquakes, 48 noises and 4 unclassified are analyzed. 45 noises are separated, which correspond to 92 % of total noises. Further experiments are required to improve suitable parameters to eliminate man made noise during micro earthquake monitoring.
    This research project also involves monitoring of seismic activity in relation to geopressured hydrothermal system. The 1995 Northern Niigata Earthquake with M 6.0 provide suitable example for a case study of geopressured hydrothermal system and seismic activity. Geopressured thermal water is discharging up to surface along fractured zones developed along active faults.

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Teaching Experience (researchmap)

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Teaching Experience

  • 自然災害環境論

    2022
    Institution name：新潟大学

  • 環境学入門

    2021
    Institution name：新潟大学

  • 水質化学分析法

    2021
    Institution name：新潟大学

  • 自然科学総論V

    2021
    Institution name：新潟大学

  • 水文地質学

    2020
    Institution name：新潟大学

  • 課題研究(地質科学)

    2020
    Institution name：新潟大学

  • 論文講読演習

    2020
    Institution name：新潟大学

  • 卒業論文

    2020
    -
    2023
    Institution name：新潟大学

  • 卒業論文Ⅱ

    2020
    Institution name：新潟大学

  • 卒業論文Ⅰ

    2020
    Institution name：新潟大学

  • 地質調査法実習III

    2019
    Institution name：新潟大学

  • 災害・復興科学演習及び実習

    2019
    Institution name：新潟大学

  • 野外実習A

    2019
    Institution name：新潟大学

  • 地質調査法実習II

    2018
    Institution name：新潟大学

  • 地質調査法実習I

    2018
    Institution name：新潟大学

  • 環境地質学入門

    2018
    Institution name：新潟大学

  • 地質学入門b

    2017
    Institution name：新潟大学

  • 地学実験B

    2017
    Institution name：新潟大学

  • 野外実習II

    2017
    Institution name：新潟大学

  • 課題研究(地質科学科)

    2012
    -
    2016
    Institution name：新潟大学

  • 環境科学特定研究Ⅰ

    2012
    Institution name：新潟大学

  • 環境科学特定演習Ⅰ

    2012
    Institution name：新潟大学

  • セミナー

    2011
    Institution name：新潟大学

  • 課題研究

    2011
    -
    2023
    Institution name：新潟大学

  • 地学実験C

    2011
    Institution name：新潟大学

  • 斜面災害特論Ⅱ

    2008
    Institution name：新潟大学

  • 地質調査法I

    2007
    Institution name：新潟大学

  • 地学実験A

    2007
    Institution name：新潟大学

  • 地質調査法II

    2007
    Institution name：新潟大学

  • 災害地球化学特論

    2007
    Institution name：新潟大学

  • 地学概論A

    2007
    Institution name：新潟大学

  • 水質化学分析法

    2007
    -
    2019
    Institution name：新潟大学

  • 環境地質学B

    2007
    -
    2018
    Institution name：新潟大学

  • 野外実習III

    2007
    -
    2018
    Institution name：新潟大学

  • 斜面災害特論II

    2007
    Institution name：新潟大学

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