气候变化领域集成服务门户(CCPortal): High-resolution seismic velocity structure and azimuthal anisotropy around the 2010 Ms=7.1 Yushu earthquake, Qinghai, China from 2D tomography

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DOI	10.1016/j.tecto.2012.08.020
	High-resolution seismic velocity structure and azimuthal anisotropy around the 2010 Ms=7.1 Yushu earthquake, Qinghai, China from 2D tomography
	Pei, Shunping; Chen, Yongshun John; Feng, Biao; Gao, Xing; Su, Jinrong
通讯作者	Chen, YJ (通讯作者)
发表日期	2013
ISSN	0040-1951
EISSN	1879-3266
起始页码	144
结束页码	151
卷号	584
英文摘要	To investigate upper crust anisotropy, a tomography algorithm was reformulated to include lateral variations in both velocity and azimuthal anisotropy, and it was applied to Pg travel time data around the epicenter of the 14 April 2010 Ms = 7.1 Yushu earthquake. A high-resolution two-dimensional (horizontal) seismic velocity and azimuthal anisotropy model was obtained using this simple tomography method including both station and event depth corrections. The results show clear anisotropy in the upper crust and it is as important as the velocity variation in explaining the travel time residuals. The most striking result is a high velocity anomaly with large anisotropy at the epicenter on the Yushu-Garze fault. The main rupture originated within this high velocity anomaly and propagated southeastward into a low velocity anomaly with small anisotropy at Yushu. The azimuthal anisotropy shows fast velocity direction along Yushu-Garze fault and larger anisotropy exists in the epicenter than surrounding regions. These results demonstrate a clear example that lateral variation and anisotropy in seismic structures of the upper crust controlled the origination (stress accumulation) and rupture propagation of the 2010 Yushu earthquake and distribution of aftershocks as well. The simple 2D Pg-wave travel time tomography method presented here introduces a new approach utilizing abundant aftershocks data for investigating the rupturing process of a major earthquake and possible fracture distribution around seismogenic zone. (C) 2012 Elsevier B.V. All rights reserved.
关键词	UPPERMOST MANTLE VELOCITIES TRAVEL-TIME TOMOGRAPHY BENEATH CHINA INVERSION MOTION MEDIA ROCK
英文关键词	Yushu earthquake; Seismic tomography; Aftershocks; Seismic velocity anomaly; Anisotropy
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000315613700014
来源期刊	TECTONOPHYSICS
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/258148
推荐引用方式 GB/T 7714	Pei, Shunping,Chen, Yongshun John,Feng, Biao,et al. High-resolution seismic velocity structure and azimuthal anisotropy around the 2010 Ms=7.1 Yushu earthquake, Qinghai, China from 2D tomography[J]. 中国科学院青藏高原研究所,2013,584.
APA	Pei, Shunping,Chen, Yongshun John,Feng, Biao,Gao, Xing,&Su, Jinrong.(2013).High-resolution seismic velocity structure and azimuthal anisotropy around the 2010 Ms=7.1 Yushu earthquake, Qinghai, China from 2D tomography.TECTONOPHYSICS,584.
MLA	Pei, Shunping,et al."High-resolution seismic velocity structure and azimuthal anisotropy around the 2010 Ms=7.1 Yushu earthquake, Qinghai, China from 2D tomography".TECTONOPHYSICS 584(2013).