气候变化领域集成服务门户(CCPortal): Spatiotemporal Change in the Stress State Around the Hypocentral Area of the 2016 Kumamoto Earthquake Sequence

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DOI	10.1029/2019JB018515
	Spatiotemporal Change in the Stress State Around the Hypocentral Area of the 2016 Kumamoto Earthquake Sequence
	Mitsuoka A.; Shito A.; Matsumoto S.; Yamashita Y.; Nakamoto M.; Sakai S.-I.; Iio Y.; Shimizu H.; Goto K.; Okada T.; Ohzono M.; Yamanaka Y.; Kosuga M.; Yoshimi M.; Asano Y.
发表日期	2020
ISSN	21699313
卷号	125 期号:9
英文摘要	For understanding the physical condition of earthquake generation, we estimated the deviatoric stress fields and fault planes of the large earthquakes in the hypocentral area of the 2016 Kumamoto earthquake sequence, central Kyushu, Japan. We analyzed precise hypocenters and their focal mechanism tensors from 1993 to 2017 and found the complex fault planes of the largest foreshock and the mainshock during the sequence. The faults of large earthquakes could not be detected from the preceding high seismic activity in the area to the mainshock. The analyses of the deviatoric stress tensors obtained from pre- and post-sequence seismic moment tensor data revealed the temporal change in the deviatoric stress field at the vicinity of the hypocenters of the largest foreshock and the mainshock. Because of this temporal change, we found that the stress level of the deviatoric stress field in this region is the same level as the co-seismic stress change caused by the two large earthquakes. We attempted to estimate the differential stress at the region using a new method, which can be applied to the heterogeneous stress fields. The average value of the estimated differential stresses in the region was 15.4 ± 10 MPa. The rotation of the principal stress axes and the low differential stress are important information to understand the physical processes of the earthquake generation and the state of the crustal stress. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	2016 Kumamoto earthquake; differential stress; fault geometry; stress field
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187633
作者单位	Institute of Seismology and Volcanology, Kyushu University, Fukuoka, Japan; Disaster Prevention Research Institute, Kyoto University, Uji, Japan; Association for the Development of Earthquake Prediction, Tokyo, Japan; Earthquake Research Institute, University of Tokyo, Tokyo, Japan; Graduate School of Science, Tohoku University, Sendai, Japan; Graduate School of Science, Hokkaido University, Sapporo, Japan; Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan; Graduate School of Science and Technology, Hirosaki University, Hirosaki, Japan; Geological Survey of Japan, AIST, Tsukuba, Japan; National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Japan
推荐引用方式 GB/T 7714	Mitsuoka A.,Shito A.,Matsumoto S.,et al. Spatiotemporal Change in the Stress State Around the Hypocentral Area of the 2016 Kumamoto Earthquake Sequence[J],2020,125(9).
APA	Mitsuoka A..,Shito A..,Matsumoto S..,Yamashita Y..,Nakamoto M..,...&Asano Y..(2020).Spatiotemporal Change in the Stress State Around the Hypocentral Area of the 2016 Kumamoto Earthquake Sequence.Journal of Geophysical Research: Solid Earth,125(9).
MLA	Mitsuoka A.,et al."Spatiotemporal Change in the Stress State Around the Hypocentral Area of the 2016 Kumamoto Earthquake Sequence".Journal of Geophysical Research: Solid Earth 125.9(2020).