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Anomalous depth dependency of the stress field in the 2007 Noto Hanto, Japan, earthquake: Potential involvement of a deep fluid reservoir

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Title: Anomalous depth dependency of the stress field in the 2007 Noto Hanto, Japan, earthquake: Potential involvement of a deep fluid reservoir
Authors: Kato, Aitaro Browse this author
Sakai, Shinichi Browse this author
Iidaka, Takashi Browse this author
Iwasaki, Takaya Browse this author
Kurashimo, Eiji Browse this author
Igarashi, Toshihiro Browse this author
Hirata, Naoshi Browse this author
Kanazawa, Toshihiko Browse this author
Katsumata, Kei Browse this author →KAKEN DB
Takahashi, Hiroaki Browse this author →KAKEN DB
Honda, Ryo Browse this author
Maeda, Takahiro Browse this author
Ichiyanagi, Masayoshi Browse this author
Yamaguchi, Teruhiro Browse this author
Kosuga, Masahiro Browse this author
Okada, Tomomi Browse this author
Nakajima, Junichi Browse this author
Hori, Shuichiro Browse this author
Nakayama, Takashi Browse this author
Hasegawa, Akira Browse this author
Kono, Toshio Browse this author
Suzuki, Syuichi Browse this author
Tsumura, Noriko Browse this author
Hiramatsu, Yoshihiro Browse this author
Sugaya, Katsunori Browse this author
Hayashi, Aiko Browse this author
Hirose, Tetsuya Browse this author
Sawada, Akihiro Browse this author
Tanaka, Keisuke Browse this author
Yamanaka, Yoshiko Browse this author
Nakamichi, Haruhisa Browse this author
Okuda, Takashi Browse this author
Iio, Yoshihisa Browse this author
Nishigami, Kin'ya Browse this author
Miyazawa, Masatoshi Browse this author
Wada, Hiroo Browse this author
Hirano, Norio Browse this author
Katao, Hiroshi Browse this author
Ohmi, Shiro Browse this author
Ito, Kiyoshi Browse this author
Doi, Issei Browse this author
Noda, Shunta Browse this author
Matsumoto, Satoshi Browse this author
Matsushima, Takeshi Browse this author
Saiga, Atsushi Browse this author
Miyamachi, Hiroki Browse this author
Imanishi, Kazutoshi Browse this author
Takeda, Tetsuya Browse this author
Asano, Youichi Browse this author
Yukutake, Yohei Browse this author
Ueno, Tomotake Browse this author
Maeda, Takuto Browse this author
Matsuzawa, Takanori Browse this author
Sekine, Shutaro Browse this author
Matsubara, Makoto Browse this author
Obara, Kazushige Browse this author
Keywords: stress
fluid
aftershocks
2007 Noto Hanto earthquake
focal mechanism
Issue Date: Mar-2011
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 38
Issue: 6
Start Page: L06306
Publisher DOI: 10.1029/2010GL046413
Abstract: We have elucidated depth variations in the stress field associated with the 2007 Noto Hanto, Japan, earthquake by stress tensor inversion using high-quality aftershock data obtained by a dense seismic network. Aftershocks that occurred above 4 km in depth indicated a strike-slip stress regime. By contrast, aftershocks in deeper parts indicated a thrust faulting stress regime. This depth variation in the stress regime correlates well with that in the slip direction derived from a finite source model using geodetic data. Furthermore, the maximum principal stress (σ1) axis was stably oriented approximately W20°N down to the depth of the mainshock hypocenter, largely in agreement with the regional stress field, but, below that depth, the σ1 axis had no definite orientation, indicating horizontally isotropic stress. One likely cause of these drastic changes in the stress regime with depth is the buoyant force of a fluid reservoir localized beneath the seismogenic zone.
Rights: Copyright 2011 American Geophysical Union.
Type: article
URI: http://hdl.handle.net/2115/57953
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高橋 浩晃

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