气候变化领域集成服务门户(CCPortal): Structural geometry of the source region for the 2013 Mw 6.6 Lushan earthquake: Implication for earthquake hazard assessment along the Longmen Shan

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DOI	10.1016/j.epsl.2014.01.018
	Structural geometry of the source region for the 2013 Mw 6.6 Lushan earthquake: Implication for earthquake hazard assessment along the Longmen Shan
	Li, Yiquan; Jia, Dong; Wang, Maomao; Shaw, John H.; He, Jiankun; Lin, Aiming; Xiong, Lin; Rao, Gang
通讯作者	Li, YQ (通讯作者)
发表日期	2014
ISSN	0012-821X
EISSN	1385-013X
起始页码	275
结束页码	286
卷号	390
英文摘要	The 2013 Mw 6.6 Lushan earthquake occurred in the Longmen Shan fold-and-thrust belt, Sichuan Province, China, near the five-year anniversary of the devastating 2008 Mw 7.8 Wenchuan earthquake. To define the fault that generated the 2013 earthquake and its relationship with the Beichuan fault, which ruptured in the Wenchuan earthquake, we construct several cross sections and a 3D structural model. The sections and models reveal that the main-shock of the Lushan earthquake occurred on a portion of the Range Front blind thrust (RFBT) and that the structural geometry of this fault varies along strike. The Lushan main-shock occurred at a location along the strike of the fault where the geologic shortening and total fault slip are greatest. A lateral ramp of the RFBT appears to coincide with the northern limit of aftershocks from the Lushan earthquake, leading to a 75 km seismic gap between the Wenchuan earthquake and the 2013 earthquake sequence. Although both the Wenchuan and Lushan earthquakes occurred within the Longmen Shan fold-and-thrust belt, different faults generated the two events. Based on this structural characterization and analysis of the aftershocks of the Wenchuan and Lushan earthquakes, we suggest that the Lushan earthquake may have been triggered by the 2008 rupture but is best considered as an independent event rather than an aftershock of the Wenchuan earthquake. The RFBT that generated the Lushan earthquake is linked to a detachment that extends into the Sichuan basin along the Triassic evaporite layer. The coulomb stress change simulation suggests that other faults linked to this detachment may have been loaded by the 2008 and 2013 earthquake, posing the risk of future earthquakes along the Longmen Shan and in the densely populated Sichuan basin. (c) 2014 Elsevier B.V. All rights reserved.
关键词	2008 WENCHUAN EARTHQUAKE W 7.9 WENCHUAN SICHUAN BASIN CRUSTAL DEFORMATION TIBETAN PLATEAU WESTERN SICHUAN GROUND MOTION EASTERN TIBET LOS-ANGELES THRUST BELT
英文关键词	Lushan earthquake; Wenchuan earthquake; structural geometry; co-seismic fault; aftershocks
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000333998400027
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
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/258373
推荐引用方式 GB/T 7714	Li, Yiquan,Jia, Dong,Wang, Maomao,et al. Structural geometry of the source region for the 2013 Mw 6.6 Lushan earthquake: Implication for earthquake hazard assessment along the Longmen Shan[J]. 中国科学院青藏高原研究所,2014,390.
APA	Li, Yiquan.,Jia, Dong.,Wang, Maomao.,Shaw, John H..,He, Jiankun.,...&Rao, Gang.(2014).Structural geometry of the source region for the 2013 Mw 6.6 Lushan earthquake: Implication for earthquake hazard assessment along the Longmen Shan.EARTH AND PLANETARY SCIENCE LETTERS,390.
MLA	Li, Yiquan,et al."Structural geometry of the source region for the 2013 Mw 6.6 Lushan earthquake: Implication for earthquake hazard assessment along the Longmen Shan".EARTH AND PLANETARY SCIENCE LETTERS 390(2014).