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  1. 防災科研関係論文

The effect of thermal pressurization on dynamic fault branching

https://nied-repo.bosai.go.jp/records/4683
https://nied-repo.bosai.go.jp/records/4683
f449d0c8-0329-4242-bca4-6ee42a1cad9c
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル The effect of thermal pressurization on dynamic fault branching
言語
言語 eng
著者 Yumi Urata

× Yumi Urata

en Yumi Urata

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Sebastien Hok

× Sebastien Hok

en Sebastien Hok

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Eiichi Fukuyama

× Eiichi Fukuyama

en Eiichi Fukuyama

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Raul Madariaga

× Raul Madariaga

en Raul Madariaga

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抄録
内容記述タイプ Other
内容記述 We numerically investigate the effect of thermal pressurization (TP) on fault branch behaviour during dynamic rupture propagation, a situation likely to occur during large earthquakes at subduction interfaces. We consider a 2-D mode II (in-plane) rupture in an infinite medium that propagates spontaneously along a planar main fault and encounters an intersection with a pre-existing branching fault. The fault system is subjected to uniform external stresses. We adopt the values used by Kame et al. We use the 2-D boundary integral equation method and the slip-weakening friction law with a Coulomb failure criterion, allowing the effective normal stress to vary as pore pressure changes due to TP. We reveal that TP can alter rupture propagation paths when the dip angle of the main fault is small. The rupture propagation paths depend on the branching angle when TP is not in effect on either of the faults, as described by Kame et al. However, the dynamic rupture processes are controlled more by TP than by the branching angle. When TP is in effect on the main fault only, the rupture propagates along the main fault. It propagates along the branch when TP is in effect on both faults. Finally, we considered the case where there is a free surface above the branch fault system. In this case, the rupture can propagate along both faults because of interaction between the free surface and the branch fault, in addition to TP on the main fault.
言語 en
書誌情報 en : GEOPHYSICAL JOURNAL INTERNATIONAL

巻 196, 号 2, p. 1237-1246, 発行日 2014-02
出版者
言語 en
出版者 OXFORD UNIV PRESS
ISSN
収録物識別子タイプ EISSN
収録物識別子 1365-246X
DOI
関連識別子 10.1093/gji/ggt457
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