Faculty Profiles - WATANABE Naoki

Papers - WATANABE Naoki

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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

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

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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

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

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.

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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

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