Faculty Profiles - WATANABE Naoki

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

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

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

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

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

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

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

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

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

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., δ18O) in water samples of Sakata and Toyanogata were measured. Samples were regularly taken at the fixed sampling points from these lagoons, and depth distribution was surveyed at one point in Toyanogata. In addition, δ18O and nutrients concentrations of water samples in Zhalong Wetland at Heilongjiang Province in China were also determined. Consequently, the following matters have been mainly clarified. (1) δ18O 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

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

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

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

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

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

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

WATANABE Naoki, SATO Hisanori, FURUYA Gen

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

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

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

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

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

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

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

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

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

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

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

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. 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. 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

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

Other Link： https://jlc.jst.go.jp/DN/JALC/00302015801?from=CiNii

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

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

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

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

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

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

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

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

Other Link： https://jlc.jst.go.jp/DN/JALC/00247680409?from=CiNii

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

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

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

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

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

日本地すべり学会誌 42 ( 1 ) 1 - 7 2005.5

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

"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

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

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

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

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

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

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

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

Deep Groundwaters in the Tertiary Type Landslides Reviewed

WATANABE Naoki, SHIRAISHI Shuichi, SATO Hisanori, SATO Osamu

45 ( 6 ) 32 - 34 1997.6

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

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

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

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

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

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

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

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

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

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

Other Link： https://jlc.jst.go.jp/DN/JALC/00041720325?from=CiNii

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

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

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

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

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

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

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.

1992 Tsunan Earthquake of M4.5, Southern Niigata Prefecture

Other Link： http://dl.ndl.go.jp/info:ndljp/pid/10810155

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

Geochemistry of groundwaters in the Matsunoyama landslides, Niigata Prefecture

Naoki Watanabe

PhD Thesis of Niigata University 1995.3

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

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

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

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

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

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

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

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

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

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

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

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

Petrology of Asakusa Volcano Reviewed

Asakusa Volcano Collaborative Research Group

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

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

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

Geology of Asakusa Volcano Reviewed

Asakusa Volcano Collaborative Research Group

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

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