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DOI	10.1785/0120090316
	Surficial Slip and Rupture Geometry on the Beichuan Fault near Hongkou during the M-w 7.9 Wenchuan Earthquake, China
	Liu-Zeng, Jing; Wen, Li; Sun, Jing; Zhang, Zhihui; Hu, Guyue; Xing, Xiucheng; Zeng, Lingsen; Xu, Qiang
通讯作者	Liu-Zeng, J (通讯作者)
发表日期	2010
ISSN	0037-1106
EISSN	1943-3573
起始页码	2615
结束页码	2650
卷号	100 期号:5B
英文摘要	Worldwide occurrence and documentation of reverse-type ruptures are sparse. Near Hongkou, the Wenchuan rupture passes through the broad Baisha River valley and provides excellent opportunities to trace the surface faulting in fine details for 13 km distance, one of the longest continuous sections along the entire rupture. In this paper, we present the results of our mapping of the surface rupture in this reach. Based on the discontinuities in slip and geometry, the rupture was divided into four sections for convenience, from west to east: the Shenxi Gou, the Miaoba, the Gaoyuan, and the Bajiao Miao sections, respectively. The vertical offset is large in the Shenxi Gou and the Bajiao Miao sections, locally reaching 5-6 m in maxima, and generally low in the Miaoba section (1-2 m or less in most places). The slip gradient for vertical offset is generally 10(-3), locally up to 10(-1), similar to that in well-documented strike-slip ruptures. Near Gaoyuan village, the surface rupture consists of two subparallel branches, with the northern one exhibiting right-lateral slip with minor southeast-side-up thrusting, while the southern one is almost pure southeast-side-up thrusting. This pattern mimics the incomplete slip-partitioning of oblique thrusting on parallel faults but at a local scale. In addition, the sense of vertical throw on these two strands is opposite to the general northwest-side-up thrusting of the Wenchuan rupture. We propose that it is likely due to the inheritance at shallow depth from the southeast-dipping geological faults, and that old fault zone structures can have a strong effect on the dynamic rupture by guiding the rupture propagation onto paths of preexisting, though locally unfavorable, dipping fault planes. We also discuss the cross-cutting slickenside striations observed near Bajiao Miao, which indicated temporal rake rotation during dynamic rupture, and their geological and seismological implications.
关键词	LOWER CRUSTAL FLOW LONGMEN SHAN SURFACE RUPTURE TIBETAN PLATEAU EASTERN MARGIN STRUCTURAL-ANALYSIS ACTIVE TECTONICS M(S)8.0 WENCHUAN ABSOLUTE STRESS EMERSON FAULT
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000283120600018
来源期刊	BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
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/257741
推荐引用方式 GB/T 7714	Liu-Zeng, Jing,Wen, Li,Sun, Jing,et al. Surficial Slip and Rupture Geometry on the Beichuan Fault near Hongkou during the M-w 7.9 Wenchuan Earthquake, China[J]. 中国科学院青藏高原研究所,2010,100(5B).
APA	Liu-Zeng, Jing.,Wen, Li.,Sun, Jing.,Zhang, Zhihui.,Hu, Guyue.,...&Xu, Qiang.(2010).Surficial Slip and Rupture Geometry on the Beichuan Fault near Hongkou during the M-w 7.9 Wenchuan Earthquake, China.BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,100(5B).
MLA	Liu-Zeng, Jing,et al."Surficial Slip and Rupture Geometry on the Beichuan Fault near Hongkou during the M-w 7.9 Wenchuan Earthquake, China".BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 100.5B(2010).