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  1. 防災科研関係論文

Internal structure and permeability of the Nojima fault, southwest Japan

https://nied-repo.bosai.go.jp/records/4295
https://nied-repo.bosai.go.jp/records/4295
5d16ab97-5aba-4c70-a39f-255552d9a248
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Internal structure and permeability of the Nojima fault, southwest Japan
言語
言語 eng
著者 Kazuo Mizoguchi

× Kazuo Mizoguchi

en Kazuo Mizoguchi

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Takehiro Hirose

× Takehiro Hirose

en Takehiro Hirose

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Toshihiko Shimamoto

× Toshihiko Shimamoto

en Toshihiko Shimamoto

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Efichi Fukuyama

× Efichi Fukuyama

en Efichi Fukuyama

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抄録
内容記述タイプ Other
内容記述 We conducted permeability measurements on representative fault rocks and surrounding country rocks taken from the Nojima fault zone, which was activated during the 1995 Kobe earthquake, under isotropic confining pressures up to 180 MPa. The results show that the Nojima fault zone consists of a low-permeability fault gouge zone (10(-20)-10(-19) m(2) at 180 MPa) within a high-permeability damaged zone of fault breccia and fractured host rock (10(-18)-10(-14) m(2) at 180 MPa). The fault gouge zone acts as a barrier to fluid flow across the fault, whereas the surrounding damage zone acts as a fluid conduit. The nature of this proposed permeability structure is consistent with the results of tests conducted on drillcore samples collected from the Nojima fault at depths of 0.6 and 1.8 km. We therefore propose that the permeability of a fault measured from fault rocks exposed at the surface can be used as a representative value for the fault to depths of up to 2 km. We also examined the possibility that thermal pressurization occurred upon the Nojima fault during the Kobe earthquake, based on the obtained permeability data. We found that frictional heating during the Kobe earthquake would have led to an increase in pore pressure at depths below 4 km, thereby resulting in a marked reduction in frictional resistance upon the fault. (C) 2007 Elsevier Ltd. All rights reserved.
言語 en
書誌情報 en : JOURNAL OF STRUCTURAL GEOLOGY

巻 30, 号 4, p. 513-524
出版者
言語 en
出版者 PERGAMON-ELSEVIER SCIENCE LTD
ISSN
収録物識別子タイプ ISSN
収録物識別子 0191-8141
DOI
関連識別子 10.1016/j.jsg.2007.12.002
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