Updated on 2022/12/01

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   Graduate School of Science and Technology Environmental Science and Technology   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   Research 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

  • Characteristics of Lagoon Water Systems and Precipitation in Niigata City in Recent Years from Oxygen and Hydrogen Stable Isotope Ratios (<i>δ</i><sup>18</sup>O, <i>δ</i>D), Tritium (T) Concentration and Various Ion Concentrations Reviewed

    Kohei Oishi, Takayuki Enomoto, Syunki Sato, Takahide Morohashi, Naoto Miyamoto, Naoki Kano, Hiroshi Imaizumi, Naoki Watanabe

    RADIOISOTOPES   69 ( 9 )   299 - 313   2020.9

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

    DOI: 10.3769/radioisotopes.69.299

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  • VARIATIONS OF WATER QUALITY ALONG ACIDIC RIVERS IN VOLCANIC AREAS OF EASTERN JAPAN Reviewed

    Takeshi Saito, Naoki Watanabe

    International Journal of GEOMATE   19 ( 71 )   36 - 41   2020.7

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:International Journal of Geomate  

    There are many acidic rivers in Japan, due to acid mine drainage (AMD) and drainage from acidic hot springs. Low pH values and relatively high concentrations of heavy metals and other trace elements are often detected in the acidic rivers. In this study, water quality parameters including pH and concentrations of major cations and anions, heavy metals, and other trace elements were investigated in nine acidic river basins located in volcanic areas of Eastern Japan. The study included both untreated river basins and basins where neutralization treatment is carried out. Variations of water quality along two acidic river basins and the mechanisms controlling the variations in water quality were also discussed. Generally, the pH values ranged from 1.31 to 5.45 in the nine river basins. Positive effects from neutralization treatment were observed along the Agatsuma river basin where pH values markedly increased and the concentrations of As, Pb, F, Fe, and Al dramatically decreased. In comparison, along the untreated Nagase river basin, the pH values gradually increased and the concentrations of As, Pb, F, Fe, and Al steadily decreased, mainly due to the dilution effect caused by mixing with other rivers. In these two river basins, harmful elements such as As, Pb, and F were probably coprecipitated with Fe and Al hydroxides. The sediments deposited in the Nagase river bed and Lake Inawashiro may therefore contain much higher concentrations of harmful elements including As, Pb, and F as were previously reported on the Shinaki Dam of the Agatsuma river basin.

    DOI: 10.21660/2020.71.5782

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  • Distribution of fossil seawater and its role in Neogene sedimentary rock landslides in Niigata, eastern marginal region of the Japan Sea Reviewed

    Nariaki Nishiyama, Masahiro Chigira, Koichi Suzuki, Naoki Watanabe

    Island Arc   29 ( 1 )   1 - 20   2020.6

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    Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    The Neogene marine sedimentary rock area in the eastern marginal region of the Japan Sea is an area with some of the highest landslide densities in Japan. Some of the landslides in this area have been known to involve saline groundwater, which can be the cause of these landslides. In order to demonstrate the relationships between landslides and saline water, topographic, geological, groundwater, and electromagnetic surveys were performed in the eastern marginal region of the Japan Sea. Many landslides and gravitational slope deformations with linear depressions and small scarps were recog-nized in the study area. The resistivity profile obtained by an electromagnetic survey suggests that there is a wide zonal distribution of saline water with salt concentrations equivalent to seawater at depths of 50–100 m or more and that the groundwater shallower than 50 m has an electrical conductivity of less than 100 mS/m. The shallow resistive groundwater is inferred to be meteoric water that replaced the saline groundwa-ter, which likely weakened the bedrock, resulting in landslides. A ridge of competent tuff overlying mudstone has many linear depressions from gravitational slope deformation and low-resistivity water to a depth of 600 m, which suggests that the mudstone was weakened by water replacement and deformed under the tuff caprock. The saline groundwater is inferred to be fossil seawater trapped in pores during sediment deposi-tion, which is brought near the ground surface along with rocks by tectonic movement in the hills. Thus, the saline water and its fresh water replacement are among the important basic causes of the landslides. The oil well data obtained in the eastern marginal region of the Japan Sea suggest that such saline water replacement has occurred widely and that replacement is likely one of the predispositions for the frequent landslides there.

    DOI: 10.1111/iar.12351

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    Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1111/iar.12351

  • CHARACTERISTICS OF RUNOFF AND STREAM WATER CHEMISTRY IN FOREST AND GRASSLAND WATERSHEDS IN THE HEADSTREAMS OF THE OKURAGAWA RIVER, SADO ISLAND, NIIGATA PREFECTURE, JAPAN Reviewed

    斎藤健志, 渡部直喜, 川邉洋

    土木学会論文集 B1(水工学)(Web)   16 ( 1 )   1 - 9   2020.4

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  • 平成30年北海道胆振東部地震による土砂災害の特徴

    王 功輝, 古谷 元, 渡部直喜, 土井一生, 馬 寧

    京都大学防災研究所年報   ( 62号A )   48 - 56   2019.10

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  • Geochemical interpretation of groundwaters in the Kostanjek landslide in the western part of Zagreb, Croatia Reviewed

    Watanabe, N, Yamamoto, S, Furuya, G, Krkač, M, Arbanas, S.M, Marui, H

    Proceedings of 4th Regional symposium on Landslides in the Adriatic-Balkan Region, Sarajevo, Bosnia and Herzegovina   27 - 30   2019.10

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  • Visualization of upwelling mechanism of high salinity groundwaters by Electromagnetic exploration : An application to the Utsunomata landslide, Niigata Prefecture Reviewed

    54 ( 5 )   209 - 214   2017.9

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

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  • Layered internal structure and breaching risk assessment of the Higashi-Takezawa landslide dam in Niigata, Japan Reviewed

    Gonghui Wang, Gen Furuya, Fanyu Zhang, Issei Doi, Naoki Watanabe, Akihiko Wakai, Hideaki Marui

    GEOMORPHOLOGY   267   48 - 58   2016.8

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

    The internal structure and geotechnical properties of landslide dams have rarely been examined in detail, although they largely control the longevity and potential failure mechanisms of the dams. During the 2004 Mid-Niigata Prefecture earthquake, thousands of landslides were triggered and many landslide dams were formed in the Imo River basin. Among these landslides dams, the biggest one that occurred in the Higashi-Takezawa district threatened both the upstream and downstream areas. Emergency and eventual permanent countermeasures were successfully performed to mitigate the hazards presented by the dam. The preserved landslide dam provides a good field study area for improving understanding of the formation and stability of similar features. To characterize its internal structure and to provide more reliable information for stability analysis, we used a multiple-channel surface-wave technique and microtremor array measurements to survey the dam's S-wave velocity (V-s) profile. Our results show that the integrated use of these methods is an effective approach for determining the S-wave velocity structure of landslide dams, irrespective of the mountainous environment in which they typically occur. The V-s profile suggests that the displaced landslide materials had been little disturbed during movement, although movement was rapid and over a long distance. We also discuss herein the landsliding mechanism and assess the breaching risk of the landslide dam due to overtopping. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.geomorph.2016.05.021

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  • Analysis of failure mechanics of the 2012 Kokugawa Landslide caused by snowmelt, Niigata Prefecture Reviewed

    Wang C.X, Yamasaki H, Watanabe N, Marui H, Furuya G, Tuladhar G.R

    日本地すべり学会誌   53 ( 2 )   50 - 57   2016.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:日本地すべり学会  

    DOI: 10.3313/jls.53.50

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    Other Link: https://jlc.jst.go.jp/DN/JLC/20022487863?from=CiNii

  • Across-arc Variations in Geochemistry of Oligocene to Quaternary Basalts from the NE Japan Arc: Constraints on Source Composition, Mantle Melting and Slab Input Composition Reviewed

    K. Shuto, R. Nohara-Imanaka, M. Sato, T. Takahashi, E. Takazawa, H. Kawabata, K. Takanashi, M. Ban, N. Watanabe, N. Fujibayashi

    JOURNAL OF PETROLOGY   56 ( 11 )   2257 - 2294   2015.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:OXFORD UNIV PRESS  

    To investigate the nature and origin of across-arc geochemical variations over time in mantle wedge derived magmas, we have carried out a geochemical study of basalts in the NE Japan arc spanning an age range from 35Ma to the present. Back-arc basalts erupted at 24-18 Ma, 10-8 Ma, 6-3Ma and 2.5-0Ma have higher concentrations of both high field strength elements (HFSE) and rare earth elements (REE) [particularly light REE (LREE) and middle REE (MREE)], and higher incompatible trace element ratios compared with frontal-arc basalts at any given time. Geochemical modeling of Nb/Yb versus Nb shows that the frontal-arc and back-arc compositional differences are independent of subduction modification and can, in many cases, be explained by different degrees of melting (higher degrees of melting for frontal-arc magmas and lower degrees of melting for back-arc magmas) of a nearly homogeneous depleted mid-ocean ridge basalt (MORB) mantle (DMM)-like source, although there are several exceptions. These include some Pliocene frontal-arc basalts that may originate from a source that is slightly more depleted than DMM, several 35-32Ma and 24-18Ma back-arc basalts derived from a lithospheric mantle source that is enriched in HFSE compared with DMM, and a rare 16-12Ma basalt that was erupted in the back-arc but was produced by a similar degree of melting to frontal-arc basalts erupted at the same time. Variations in ratios of fluid-mobile and -immobile elements and those of melt-mobile and -immobile elements for the 35-0Ma NE Japan basalts indicate that the principal subduction component added to the source mantle prior to generation of these basalt magmas is a sediment-derived melt. Comparison of Sr and Nd isotopic compositions for Pacific Ocean MORB, the NE Japan basalts and subducting sediments suggests that the isotopic compositions of most post-16Ma more depleted back-arc basalts can be explained by the addition of &lt;2% bulk sediment; the most enriched isotope compositions of the subcontinental lithosphere-derived magmas can be accounted for by addition of a maximum 5-7% Japan Trench Sediment (JTS), if the original Sr and Nd compositions of the lithosphere approximated that of DMM. The Sr and Nd isotope composition of the frontal-arc basalts can be accounted for by the addition of 1-5% JTS. A depleted asthenospheric mantle (DMM-like) upwelling model with interaction between asthenospheric mantle-derived magmas and overlying lithospheric mantle can account for the geochemical characteristics of the 35-0Ma NE Japan basalts. The frontal-arc magmas were generally generated by higher degrees of melting of the shallower part of the asthenospheric mantle, whereas the back-arc magmas resulted from lower degrees of melting of the deeper part of asthenospheric mantle. These latter magmas underwent interaction with the lithospheric mantle, resulting in more enriched Sr and Nd isotopic signatures for the pre-18Ma back-arc basalts and post-22Ma frontal-arc basalts, but less interaction, resulting in more depleted Sr and Nd isotopic signatures, for most of the back-arc basalts younger than 16 Ma.

    DOI: 10.1093/petrology/egv073

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  • Investigation on the internal structure of Higashi-Takezawa landslide dam using surface wave method and microtremor array measurements Reviewed

    WANG Gonghui, FURUYA Gen, DOI Issei, WATANABE Naoki, WAKAI Akihiko, MARUI Hideaki

    Landslides   52 ( 5 )   233 - 238   2015.9

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

    During the 2004 Mid-Niigata Prefecture earthquake, thousands of landslides were triggered, among them two large scale landslides (Higashi-Takezawa and Terano landslides) occurred within past landslide masses and dammed the river at the toe of the landslides. To understand the internal structure of the landslide dam and then provide more reliable parameters for the stability analysis of landslide dam, we used a multiple channel surface wave technique and microtremor array measurements to survey the S-wave velocity profile. The results showed that the integrated use of these methods is effective for the S-wave velocity structure of landslide dam, irrespective of the mountainous environment. Based on survey results, the landsliding mechanism and further research on elevating the reliability of landslide dam stability were discussed.

    DOI: 10.3313/jls.52.233

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    Other Link: https://jlc.jst.go.jp/DN/JLC/20015943291?from=CiNii

  • Environmental characteristics of lagoon waters in Niigata Prefecture, Japan,and the effect of precipitation on the water quality of lagoon Reviewed

    Tiemuer A, Li C, Pang M, Kano N, Imaizumi H, Watanabe N

    Energy and Environment: Proceedings of the 2014 International Conference on Energy and Environment (ICEE 2014)   73 - 76   2015.4

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

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  • Isotopic and Chemical Characteristics of Lagoon Waters in Niigata Prefecture, Japan Reviewed

    Adilijiang Tiemuer, Naoki Kano, Hiroshi Imaizumi, Naoki Watanabe

    Journal of Environmental Science and Engineering   2015.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:David Publishing Company  

    DOI: 10.17265/2162-5298/2015.03.001

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  • Numerical Simulations for the Possible Future Geohazard Events in the Rjecina Valley, Croatia Reviewed

    Chunxiang Wang, Hideaki Marui, Naoki Watanabe, Gen Furuya

    ENGINEERING GEOLOGY FOR SOCIETY AND TERRITORY, VOL 2: LANDSLIDE PROCESSES   2   1485 - 1489   2015

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:SPRINGER INT PUBLISHING AG  

    Landslide, debris flow and rockfall are the main geohazards in the Rjecina River catchment. The Grohovo landslide is located on the northeastern slope in the central part of the Rjecina river valley just downstream of the Valici dam. As the effects of intense rainfall or earthquake, two potential geohazard events could occur. One scenario is that the slope deposits of Grohovo landslide moving towards the channel of the Rjecina River will form a landslide-dam. Another scenario is that the slope deposits mixing with water will form a debris flow arriving at the City of Rijeka. In this paper, the formation of landslide-dam and the debris-flow are simulated by two integrated models using GIS to represent the dynamic process across 3D terrains. GIS-based revised Hovland's 3D limit equilibrium model is used to simulate the movement and stoppage of the slope deposits to form landslide-dam. The simulation result shows about 9 m landslide-dam formed. GIS-based depth-averaged 2D numerical model is used to predict the runout distance and inundated area of a debris flow. As a result, the simulated debris-flow takes about 16 min to travel about 6 km along the Rjecina River valley arriving at the City of Rijeka.

    DOI: 10.1007/978-3-319-09057-3_263

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  • Comparisons and Numerical Simulations of Two Debris-Flow Events Induced by the 2011 Northern Nagano Prefecture Earthquake and by the 2008 Iwate-Miyagi Nairiku Earthquake Reviewed

    Chunxiang Wang, Hideaki Marui, Naoki Watanabe

    ENGINEERING GEOLOGY FOR SOCIETY AND TERRITORY, VOL 2: LANDSLIDE PROCESSES   2   747 - 752   2015

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:SPRINGER INT PUBLISHING AG  

    Debris flows triggered by earthquake show different occurrence mechanism, movement characteristics and failure modes with the common debris flows under gravity, because of the influence of seismic force, snowpack, different topography, lithology etc. In this paper, the Tatsunokuchi debris flow induced by the 2011 Northern Nagano Prefecture Earthquake and Dozou-sawa debris flow caused by the 2008 Iwate-Miyagi Nairiku Earthquake are analyzed. The two debris flows can be considered as composite actions of seismic force and snow. This paper compares the occurrence conditions, movement processes and geomorphic characteristics of the two debris flows and simulates the runout distance and inundated area using a GIS-Based depth-averaged two-dimensional numerical model. The simulations reproduce the propagation and deposition across the actual three-dimensional topography and the results are in good agreement with the investigation by comparing with the photographs. The entrained-snow along the flow path alters the speed and runout distance of the debris flows. The lubricating effect of snow in the movement process is discussed.

    DOI: 10.1007/978-3-319-09057-3_126

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  • Use of a GIS-based 3D deterministic slope stability predicting tool for landslide hazard assessment in Zagreb hilly area, Croatia Reviewed

    Wang C, Marui H, Watanabe N, Arbanas S.M

    Proceedings of INTERPRAEVENT 2014 in the Pacific Rim   1   211 - 216   2014.11

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  • Shallow landslide susceptibility mapping for Zagreb hilly area, Croatia Reviewed

    Chunxiang Wang, Snjezana MihaliĆ Arbanas, Hideaki Marui, Naoki Watanabe, Gen Furuya

    Landslide Science for a Safer Geoenvironment: Volume 2: Methods of Landslide Studies   ( 2 )   527 - 531   2014.1

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

    The aim of this study is to map the landslide susceptibility of the hilly area of Mt. Medvednica located in the northwestern part of the City of Zagreb, Croatia. Landslides in this region are mostly shallow movements of superficial deposits along contacts with fresh deposits of soil and cause significant economic losses by damaging houses and the urban infrastructure. The method used here is the deterministic slope stability analysis model SINMAP which is developed by Pack et al. (A stability index approach to terrain stability hazard mapping. SINMAP user’s manual, 1998
    A stability index approach to terrain stability hazard mapping. SINMAP user’s manual, 2005). SINMAP is a raster based slope stability predictive tool based on coupled hydrological-infinite slope stability model. This approach applies to shallow translational landsliding phenomena controlled by shallow ground water convergence. The input data required for this model are (1) inventory of past landslides in a point vector format, (2) Digital Elevation Model (DEM) of the study area, (3) geotechnical data such as soils strength properties, thickness of soil above the failure plane, and (4) hydrological data such as soil hydraulic conductivity and the rainfall. Because the geotechnical data and hydrological data are highly variable in both space and time, the method does not require numerically precise input and accepts ranges of values that represent this uncertainly. The major output of this model is the stability index grid theme, which can be used as a landslide susceptibility map. The results also provided slope area plots and statistical summary for each calibration region in the study area facilitating the data interpretation. The landslide susceptibility map which is developed in this study is also compared with the results from the Analytic Hierarchy Process (AHP) method and aerial photo interpretation.

    DOI: 10.1007/978-3-319-05050-8_81

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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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  • Shallow landslides susceptibility mapping using SINMAP in Zagreb mountainous region, Croatia Reviewed

    Wang C, Arbanas S.M, Marui H, Watanabe N, Furuya G

    Proceedings of the 1st Regional Symposium on Landslides in the Adriatic-Balkan Region   66 - 72   2014.1

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

    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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  • 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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  • 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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    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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    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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  • 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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    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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  • 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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  • 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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  • 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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    DOI: 10.3178/jjshwr.18.140

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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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    DOI: 10.11475/sabo1973.57.5_39

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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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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    Other Link: http://hdl.handle.net/10191/39178

  • 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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    Other Link: http://hdl.handle.net/10191/39165

  • 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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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Association for the Geological Collaboration in Japan  

    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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    Language:Japanese   Publisher:The Geological Society of Japan  

    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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    Language:Japanese   Publisher:The Geological Society of Japan  

    DOI: 10.14863/geosocabst.1990.0_172

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Books

  • 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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    Language:Japanese Book type:Dictionary, encyclopedia

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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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    Language:Japanese Book type:General book, introductory book for general audience

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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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MISC

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Research Projects

  • 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

    科学研究費助成事業  萌芽研究

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    Grant type:Competitive

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

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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

  • 卒業論文

    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

  • 環境地質学入門

    2018
    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

  • 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
    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

  • 災害地球化学特論

    2007
    Institution name:新潟大学

  • 地質調査法II

    2007
    Institution name:新潟大学

  • 地学概論A

    2007
    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

  • 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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