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DOI	10.29382/eqs-2020-0161-01
	Stress drop assessment of the August 8, 2017, Jiuzhaigou earthquake sequence and its tectonic implications
	He, Xi; Zhao, Lian-Feng; Xie, Xiao-Bi; Shen, Lin; Wang, Wei-Min; Yao, Zhen-Xing
通讯作者	Zhao, LF (通讯作者)
发表日期	2020
ISSN	1674-4519
EISSN	1867-8777
起始页码	161
结束页码	176
卷号	33 期号:4
英文摘要	By using a broadband Lg attenuation model developed for the Tibetan Plateau, we isolate source terms by removing attenuation and site effects from the observed Lg-wave displacement spectra of the M 7.0 earthquake that occurred on August 8, 2017, in Jiuzhaigou, China, and its aftershock sequence. Thus, the source parameters, including the scalar seismic moment, corner frequency and stress drop, of these events can be further estimated. The estimated stress drops vary from 47.1 kPa to 7149.6 kPa, with a median value of 59.4 kPa and most values falling between 50 kPa and 75 kPa. The estimated stress drops show significant spatial variations. Lower stress drops were mainly found close to the mainshock and on the seismogenic fault plane with large coseismic slip. In contrast, the highest stress drop was 7.1 MPa for the mainshock, and relatively large stress drops were also found for aftershocks away from the major seismogenic fault and at depths deeper than the zone with large coseismic slip. By using a statistical method, we found self-similarity among some of the aftershocks with a nearly constant stress drop. In contrast, the stress drop increased with the seismic moment for other aftershocks. The amount of stress released during earthquakes is a fundamental characteristic of the earthquake rupture process. As such, the stress drop represents a key parameter for improving our understanding of earthquake source physics.
关键词	M(S)7. 0 EARTHQUAKE SEISMOGENIC STRUCTURE CRUSTAL STRUCTURE SOURCE PARAMETERS TIBETAN PLATEAU SOURCE SPECTRA CHINA AFTERSHOCKS BENEATH FIELD
英文关键词	scalar seismic moment; corner frequency; stress drop; Lg attenuation; Jiuzhaigou earthquake
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000647125600001
来源期刊	EARTHQUAKE SCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259831
推荐引用方式 GB/T 7714	He, Xi,Zhao, Lian-Feng,Xie, Xiao-Bi,et al. Stress drop assessment of the August 8, 2017, Jiuzhaigou earthquake sequence and its tectonic implications[J]. 中国科学院青藏高原研究所,2020,33(4).
APA	He, Xi,Zhao, Lian-Feng,Xie, Xiao-Bi,Shen, Lin,Wang, Wei-Min,&Yao, Zhen-Xing.(2020).Stress drop assessment of the August 8, 2017, Jiuzhaigou earthquake sequence and its tectonic implications.EARTHQUAKE SCIENCE,33(4).
MLA	He, Xi,et al."Stress drop assessment of the August 8, 2017, Jiuzhaigou earthquake sequence and its tectonic implications".EARTHQUAKE SCIENCE 33.4(2020).