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Journal Articles

A Feasiblity study on research techniques for subsurface active faults

Kinoshita, Hirohisa; Nohara, Tsuyoshi; Nakata, Takashi*; Ikeda, Yasutaka*; Ito, Kiyoshi*; Otsuki, Kenshiro*; Sagiya, Takeshi*; Takada, Keita*; Toda, Shinji*

Katsudanso Kenkyu, (25), p.27 - 37, 2005/06

Results of numerical analyses and field studies in the epicenter area of the 2000 Tottoriken-seibu earthquake suggest that several research techniques are effective for identifying subsurface active faults unaccompanied with remarkable surface earthquake faults. Field observation of the lineaments found in the area by detailed air-photo interpretation revealed that most of them are accompanied by faults and/or dikes, and some of them show minor slips at the time of the earthquake. Crustal deformation caused by the activity of the subsurface seismogenic faults is deduced by numerical analyses based on seismic and geodetic data. The vertical deformation assumed from the height changes of the terraces along the river across the epicenter area suggests that cumulative uplift and subsidence associated with left-lateral strike-slip has been continuing. Offsets rate of the streams and uplift rate of the river terraces surfaces show good agreement with the estimate from the parameter of the earthquake faults model. Identification of active faults without clear surface evidence before occurrence of earthquakes is a difficult issue, and the techniques adopted in this study will probably provide relevant information effective to locate subsurface active faults.

JAEA Reports

Summary report of databases for the long-term stability of geological environment

Umeda, Koji; Nohara, Tsuyoshi; Fujiwara, Osamu; Asamori, Koichi; Kinoshita, Hirohisa; Nakatsuka, Noboru

JNC TN7400 2004-004, 58 Pages, 2004/08

JNC-TN7400-2004-004.pdf:3.91MB

This report summarizes databases for the long-term stability of geological environment in Japan.

Journal Articles

Variations of gravity anomaly roughness in Chugoku district, Japan: Relationship with distributions of topographic lineaments

Kudo, Takeshi; Yamamoto, Akihiko*; Nohara, Tsuyoshi; Kinoshita, Hirohisa; Shichi, Ryuichi*

Earth Planets and Space, 56(5), p.e5 - e8, 2004/00

 Times Cited Count:6 Percentile:17.99(Geosciences, Multidisciplinary)

We investigate whether distributions of topographic lineaments in Chugoku district, Japan, may be related to variations of standard deviation (SD) of gravity anomalies. Tectonic movement may disturb lateral continuities of crustal structures at weak zones. These lateral discontinuities of the density structure cause undulations of gravity anomaly fields whose complexities can be an indicator of the past crustal instability. On the other hand, topographic lineaments are formed along weak crustal zones. We would expect therefore that the gravity anomaly complexities have some relations to distributions of surface lineaments. As an index of gravity anomaly complexities in terms of which we interpret spatial distribution of topographic lineaments, we employ Bouguer anomaly SD inside a circular region with adequate radius. The results show that locations of the lineaments, which could be diagnostic of heterogeneity of the previously damaged crust, tend to coincide with those of high SD area

Journal Articles

Variations of Standard Deviation of Gravity Anomalies in Chugoku District, Japan - Relationship with Distributions of Topographic Lineaments -

Kudo, Takeshi; Nohara, Tsuyoshi; Kinoshita, Hirohisa; Yamamoto, Akihiko*; Shichi, Ryuichi*

American Geophysical Union 2003 Fall Meeting, P. F1428, 2003/00

Relationship between distributions of topographic lineaments and variations of standard deviation of gravity anomalies in Chugoku district, Japan is investigated. Tectonic movement may disturb lateral continuities of crustal structures at weak zones. Lateral discontinuities of the density structure cause undulations of gravity anomaly field over them. Therefore, complexities of the gravity anomaly field might be an indicator of the past crustal instability. On the other hand, topographic lineaments are formed along zones of inherent crustal weakness. Therefore, the gravity anomaly complexities should have some relations to distributions of surface lineaments. In order to verify this conjecture, we investigated gravity anomaly complexities in relation to the spatial distributions of topographic lineaments.

JAEA Reports

Excavation survey by "Geo-slicer" sampler on the Mozumi-Sukenobu fault of investigation for fault activities of the Mozumi-Sukenobu fault

Takemura, Tomoyuki*; Sakogaichi, Kaoru*; Takebe, Akimitsu*; Inoue, Motoi*; Niimi, Ken*; Kinoshita, Hirohisa*

JNC TJ7420 2005-051, 93 Pages, 1999/03

JNC-TJ7420-2005-051.pdf:23.99MB

The Atotsugawa active fault system (AFS) extends 60km or more in the northern Hida Mountains of central Japan, traced ENE to WSW trend. The Hietsu earthquake occurred along the AFS. The studies on the AFS started in April 1996 as

Oral presentation

Study of the features of subsurface active faults; Features estimated from the damaging earthquakes, geological structure and diastrophism

Nohara, Tsuyoshi; Nakata, Takashi*; Sagiya, Takeshi*; Kinoshita, Hirohisa; Shimada, Koji

no journal, , 

Features of subsurface active faults are studied using data of the damaging earthquake, geological structure and diastrophism. It is considered that the scales of the subsurface active faults are not more than 6.6 (Mw). The hypocenter of the damaging earthquakes distribute around the Quaternary volcanoes and the active faults. The direction of strike and displacement of the active faults and the earthquake faults of the damaging earthquakes occurred around the active faults are almost same. The dispersion of the deformation of the mylonite zone related to geological condition may be one of the indicators of generation of subsurface active fault. GPS data analysis for the Atotsugawa fault can be confirmed the activity of this active fault zone. GPS data do not indicate the presence of many unknown subsurface active faults.

Oral presentation

Where has comparatively big scale earthquake occurred?; Trial of the synthetic analysis from a damage earthquake, geology, crust structure and crustal movement

Nohara, Tsuyoshi; Nakata, Takashi*; Shimada, Koji; Niwa, Masakazu; Kinoshita, Hirohisa; Sagiya, Takeshi*

no journal, , 

Features of subsurface active faults are studied using data of the damaging earthquake, geological structure and diastrophism. The hypocenter of the damaging earthquakes distribute around the Quaternary volcanoes and the active faults. The direction of strike and displacement of the active faults and the earthquake faults of the damaging earthquakes occurred around the active faults are almost same. The dispersion of the deformation of the mylonite zone related to geological condition may be one of the indicators of generation of subsurface active fault.

Oral presentation

A Study of evaluation of influence of long term topographic perturbations on groundwater flow conditions

Saegusa, Hiromitsu; Onoe, Hironori; Kinoshita, Hirohisa*; Sasao, Eiji; Kosaka, Hiroshi*; Tokusu, Mitsuhiro*; Yoden, Toshiaki*

no journal, , 

no abstracts in English

Oral presentation

Hydrogeological Modeling and Groundwater Flow Simulation considering long-term behavior of geological environment

Onoe, Hironori; Saegusa, Hiromitsu; Sasao, Eiji; Kinoshita, Hirohisa*; Kosaka, Hiroshi*

no journal, , 

no abstracts in English

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