气候变化领域集成服务门户(CCPortal): Rupture process of March 10, 2014, M(w)6. 9 Earthquake in the northwestern coast of California

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DOI	10.6038/cjg20150117
	Rupture process of March 10, 2014, M(w)6. 9 Earthquake in the northwestern coast of California
	Cao Lei; Hao Jin-Lai; Wang Wei-Min; Yao Zhen-Xing
通讯作者	Cao, L (通讯作者)
发表日期	2015
ISSN	0001-5733
起始页码	194
结束页码	203
卷号	58 期号:1
英文摘要	A strong earthquake (M(w)6. 9) occurred in the Gorda plate off the northwestern coast of California in March 10, 2014 (Beijing Time). The rupture process of the earthquake is determined by the waveform inversion method using far-field body waveform records provided by IRIS. After that, we analyze the reason why the earthquake did not cause serious hazards and trigger tsunami, and provide new evidence to the research of dynamics study in the area. The focal mechanism of the earthquake is obtained by dislocation source model utilizing 19 far-field P vertical waveform records with uniform azimuth coverage and 13 near-field P-wave initial motions. Based on the obtained focal mechanism, we get the strike angle of fault rupture surface combined with the geological structure background. In the following finite fault inversion, the fault surface is divided into 17 X 9 subfaults to simulate the temporal and spatial distribution of the slips, along with the use of 18 far-field P vertical waveform records and 21 far-field SH tangent waveform records, then we can retrieve the rupture process of the earthquake using waveform inversion method with the multi-reflection effect under consideration. Based on the seawater-layered model, the focal mechanism solution based on the shear dislocation source model indicates that this event occurred on the rupture plane (strike angle 323 degrees, dip angle 86. 1 degrees, rake angle -180 degrees, focal depth 10. 6 km) is a high-angle strike-slip faulting. The rupture process is rather simple, the distribution of major slips is concentered in the region of 35 km X 9 km above the source, the rupture lasts about 19 seconds, the average rupture velocity is about 2. 7 km . s(-1), the larger slips distribute along the strike direction, and the maximum slip is 249 cm. The earthquake is an M(w)6. 9 strike-slip event with steep dip angle that occurs in the Gorda plate. The earthquake is a pure strike-slip faulting event occurring beneath the seabed, the fault surface is nearly vertical, so it did not cause great damage to the cities off the coast. Since the earthquake does not change the topography of the seafloor in the rupture process, so there is no big displacement of seawater, thus, it won't trigger a large-scale tsunami.
关键词	NORTHERN CALIFORNIA TRIPLE JUNCTION TECTONICS MENDOCINO CHINA SICHUAN
英文关键词	Northwestern coast of California; Dislocation source; Finite fault model; Waveform inversion; Rupture process of source
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000349136200017
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/258454
推荐引用方式 GB/T 7714	Cao Lei,Hao Jin-Lai,Wang Wei-Min,et al. Rupture process of March 10, 2014, M(w)6. 9 Earthquake in the northwestern coast of California[J]. 中国科学院青藏高原研究所,2015,58(1).
APA	Cao Lei,Hao Jin-Lai,Wang Wei-Min,&Yao Zhen-Xing.(2015).Rupture process of March 10, 2014, M(w)6. 9 Earthquake in the northwestern coast of California.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,58(1).
MLA	Cao Lei,et al."Rupture process of March 10, 2014, M(w)6. 9 Earthquake in the northwestern coast of California".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 58.1(2015).