气候变化领域集成服务门户(CCPortal): Non-Double-Couple Microearthquakes in the Focal Area of the 2000 Western Tottori Earthquake (M 7.3) via Hyperdense Seismic Observations

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DOI	10.1029/2019GL084841
	Non-Double-Couple Microearthquakes in the Focal Area of the 2000 Western Tottori Earthquake (M 7.3) via Hyperdense Seismic Observations
	Hayashida Y.; Matsumoto S.; Iio Y.; Sakai S.; Kato A.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:4
英文摘要	Earthquakes with non-double-couple (NDC) components are indicators of geometric fault complexity, anisotropy, tensile failure, and fluid flow effects. NDC earthquakes have been observed in volcanic zones and interpreted as faulting related to fluid effects in the hypocentral region. In this study, we provide evidence of the occurrence of microearthquakes with NDC components in a tectonic zone. Aftershocks of the 2000 Western Tottori earthquake revealed definite NDC components based on a polarity analysis of the first P wave motion data from a hyperdense seismic observation. We modeled these events using both shear faulting with tensile failure and multiple shear ruptures. Six of the eight NDC events were well modeled by shear faults accompanied with an opening tensile crack. These results suggest that pressurized fluid or a weak tensile crack may exist along the rupture zone of the Tottori earthquake. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Faulting; Flow of fluids; Seismic waves; Fluid flow effect; Focal spheres; hyperdense observation; Micro-earthquakes; non-double-couple; Pressurized fluids; Seismic observation; Tensile crack; Earthquakes; earthquake event; earthquake hypocenter; earthquake rupture; faulting; focal mechanism; observational method; P-wave; tensile strength
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170697
作者单位	Graduate School of Science, Kyushu University, Fukuoka, Japan; Institute of Seismology and Volcanology, Kyushu University, Fukuoka, Japan; Disaster Prevention Research Institute, Kyoto University, Uji, Japan; Earthquake Research Institute, University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Hayashida Y.,Matsumoto S.,Iio Y.,et al. Non-Double-Couple Microearthquakes in the Focal Area of the 2000 Western Tottori Earthquake (M 7.3) via Hyperdense Seismic Observations[J],2020,47(4).
APA	Hayashida Y.,Matsumoto S.,Iio Y.,Sakai S.,&Kato A..(2020).Non-Double-Couple Microearthquakes in the Focal Area of the 2000 Western Tottori Earthquake (M 7.3) via Hyperdense Seismic Observations.Geophysical Research Letters,47(4).
MLA	Hayashida Y.,et al."Non-Double-Couple Microearthquakes in the Focal Area of the 2000 Western Tottori Earthquake (M 7.3) via Hyperdense Seismic Observations".Geophysical Research Letters 47.4(2020).