Prestate of Stress and Fault Behavior During the 2016 Kumamoto Earthquake (M7.3)
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- Matsumoto, Satoshi
- Institute of Seismology and Volcanology, Kyushu University
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- Yamashita, Yusuke
- Disaster Prevention Research Institute, Kyoto University
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- Nakamoto, Manami
- National Institute of Polar Research, Tokyo
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- Miyazaki, Masahiro
- Disaster Prevention Research Institute, Kyoto University
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- Sakai, Shinichi
- Earthquake Research Institute, University of Tokyo
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- Iio, Yoshihisa
- Disaster Prevention Research Institute, Kyoto University
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- Shimizu, Hiroshi
- Institute of Seismology and Volcanology, Kyushu University
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- Goto, Kazuhiko
- Graduate School of Science and Engineering, Kagoshima University
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- Okada, Tomomi
- Graduate School of Science, Tohoku University
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- Ohzono, Mako
- Graduate School of Science, Hokkaido University
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- Terakawa, Toshiko
- Graduate School of Environmental Studies, Nagoya University
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- Kosuga, Masahiro
- Graduate School of Science and Technology, Hirosaki University
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- Yoshimi, Masayuki
- Geological Survey of Japan, AIST
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- Asano, Youichi
- National Research Institute for Earth Science and Disaster Resilience
Bibliographic Information
- Other Title
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- Prestate of Stress and Fault Behavior During the 2016 Kumamoto Earthquake (<i>M</i>7.3)
Abstract
Fault behavior during an earthquake is controlled by the state of stress on the fault. Complex coseismic fault slip on large earthquake faults has recently been observed by dense seismic networks, which complicates strong motion evaluations for potential faults. Here we show the three‐dimensional prestress field related to the 2016 Kumamoto earthquake. The estimated stress field reveals a spatially variable state of stress that forced the fault to slip in a direction predicted by the “Wallace and Bott Hypothesis.” The stress field also exposes the pre‐condition of pore fluid pressure on the fault. Large coseismic slip occurred in the low‐pressure part of the fault. However, areas with highly pressured fluid also showed large displacement, indicating that the seismic moment of the earthquake was magnified by fluid pressure. These prerupture data could contribute to improved seismic hazard evaluations.
Journal
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- Geophysical Research Letters
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Geophysical Research Letters 45 (2), 637-645, 2018-01-28
American Geophysical Union (AGU)
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Keywords
Details 詳細情報について
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- CRID
- 1050282810834091008
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- NII Article ID
- 120006457163
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- ISSN
- 00948276
- 19448007
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- HANDLE
- 2433/230618
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- Web Site
- https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2F2017GL075725
- https://onlinelibrary.wiley.com/doi/pdf/10.1002/2017GL075725
- https://onlinelibrary.wiley.com/doi/full-xml/10.1002/2017GL075725
- http://api.wiley.com/onlinelibrary/chorus/v1/articles/10.1002%2F2017GL075725
- https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2017GL075725
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- Crossref
- CiNii Articles
- KAKEN