| 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)
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