气候变化领域集成服务门户(CCPortal): Surface ruptures on the transverse Xiaoyudong fault: A significant segment boundary breached during the 2008 Wenchuan earthquake, China

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DOI	10.1016/j.tecto.2012.09.024
	Surface ruptures on the transverse Xiaoyudong fault: A significant segment boundary breached during the 2008 Wenchuan earthquake, China
	Liu-Zeng, Jing; Sun, Jing; Wang, Peng; Hudnut, Kenneth W.; Ji, Chen; Zhang, Zhihui; Xu, Qiang; Wen, Li
通讯作者	Liu-Zeng, J (通讯作者)
发表日期	2012
ISSN	0040-1951
EISSN	1879-3266
起始页码	218
结束页码	241
卷号	580
英文摘要	The similar to 220 km-long rupture of the 2008 Mw 7.9 Wenchuan earthquake breached several km-scale geometric discontinuities along strike, including the previously un-mapped NW-trending Xiaoyudong fault, connecting between the two major, NE-trending rupture planes on the Beichuan and Pengguan Faults. In this paper, we present high-resolution mapping of the 8-km-long surface breaks and sinistral oblique thrusting coseismic slip on the Xiaoyudong fault. Scarp height is the largest at the NW end, reaching 3.5 m, and decreases southward in steps to less than 0.2 m, with an average slip gradient of 6 x 10(-3) at a few tens of meters length scale, but up to 50 x 10(-3) locally. Left-lateral offsets co-vary with the vertical component. The largest sinistral slip vector we observed is 2.2 m. Geological and geophysical evidence suggests that the Xiaoyudong fault is likely a similar to 30 degrees SW-dipping lateral ramp that soles into the Pengguan fault, and at its northwestern end intersects with the Beichuan fault, where the latter has a step in the fault plane. Kinematically, the Xiaoyudong fault functions as a tear and conjugate fault and coincides with significant coseismic slip rake rotations on both the Beichuan and Pengguan Faults. Similar correlation of fault bends with sharp changes in faulting style occurs at other steps along the Wenchuan rupture. The Xiaoyudong fault may have played a positive role in linking coseismic slip partitioning between parallel reverse fault planes, facilitating the growth of a longer and more destructive rupture. This highlights the role of tear faults in bridging ruptures between segments, such that reverse-type ruptures can breach steps wider than anticipated from strike-slip fault examples. Transfer faults are common, and perhaps poorly documented features in reverse fault systems and their roles in ruptures may increase the maximum potential earthquake magnitude for fold-and-thrust belts. (C) 2012 Elsevier B.V. All rights reserved.
关键词	W 7.9 WENCHUAN 1992 LANDERS EARTHQUAKE ACTIVE THRUST-FAULT PALEOSEISMIC IMPLICATIONS VERTICAL EXPOSURE SLIP DISTRIBUTION CHELUNGPU FAULT WESTERN TAIWAN LONGMEN SHAN TIBETAN PLATEAU
英文关键词	Wenchuan earthquake; Xiaoyudong fault; Surface breaks; Lateral ramp; Geometrical complexity; Coseismic slip transfer
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000316974100014
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/258073
推荐引用方式 GB/T 7714	Liu-Zeng, Jing,Sun, Jing,Wang, Peng,et al. Surface ruptures on the transverse Xiaoyudong fault: A significant segment boundary breached during the 2008 Wenchuan earthquake, China[J]. 中国科学院青藏高原研究所,2012,580.
APA	Liu-Zeng, Jing.,Sun, Jing.,Wang, Peng.,Hudnut, Kenneth W..,Ji, Chen.,...&Wen, Li.(2012).Surface ruptures on the transverse Xiaoyudong fault: A significant segment boundary breached during the 2008 Wenchuan earthquake, China.TECTONOPHYSICS,580.
MLA	Liu-Zeng, Jing,et al."Surface ruptures on the transverse Xiaoyudong fault: A significant segment boundary breached during the 2008 Wenchuan earthquake, China".TECTONOPHYSICS 580(2012).