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DOI	10.6038/cjg2021O0320
	Source characteristics of the 2020 Alaska M(w)7. 8 earthquake and seismic risk analysis of adjacent areas
	Zhou Yun; Li YuQing; Wang WeiMin; Wang Xun; Pan ZhengYang; He JianKun
通讯作者	Wang, WM (通讯作者)
发表日期	2021
ISSN	0001-5733
起始页码	498
结束页码	506
卷号	64 期号:2
英文摘要	On July 22, 2020, an earthquake with M(w)7.8 occurred in the southern part of Alaska Peninsula, USA. In this paper, the focal mechanism and rupture process of this earthquake are inversed with the far-field seismic waveform records and coseismic displacement data of near-field GPS stations. The results show that the Alaskan earthquake is a thrust type earthquake with a focal depth of 23km, a fault dip of about 17 degrees, and a maximum coseismic displacement of 914cm on the fracture surface. The seismic moment of the earthquake is 6. 94X 10(20) N.m and the magnitude is M(w)7.8. In addition, the rupture is not simply symmetrically distributed around the source. The rupture direction and aftershock distribution of the earthquake generally show a SW extension trend. According to the calculation results of plate convergence rate and fault locking ratio, the eastern segment of Shumagin seismic gap is capable of M8 earthquake. In terms of recurrence period, there are different intervals between the western and eastern segments of Shumagin, and they may be in different seismic periods.
关键词	STRAIN ACCUMULATION SHUMAGIN ISLANDS GREAT EARTHQUAKES RUPTURE PROCESS ENERGY-RELEASE GAP ARC PENINSULA SEGMENT ABSENCE
英文关键词	Alaska earthquake in 2020; Recurrence cycle; Seismic gap; Joint inversion
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000617909800009
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
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/260172
推荐引用方式 GB/T 7714	Zhou Yun,Li YuQing,Wang WeiMin,et al. Source characteristics of the 2020 Alaska M(w)7. 8 earthquake and seismic risk analysis of adjacent areas[J]. 中国科学院青藏高原研究所,2021,64(2).
APA	Zhou Yun,Li YuQing,Wang WeiMin,Wang Xun,Pan ZhengYang,&He JianKun.(2021).Source characteristics of the 2020 Alaska M(w)7. 8 earthquake and seismic risk analysis of adjacent areas.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,64(2).
MLA	Zhou Yun,et al."Source characteristics of the 2020 Alaska M(w)7. 8 earthquake and seismic risk analysis of adjacent areas".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 64.2(2021).