Complex surface rupturing and related formation mechanisms in the Xiaoyudong area for the 2008 Mw 7.9 Wenchuan Earthquake, China

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Title:	Complex surface rupturing and related formation mechanisms in the Xiaoyudong area for the 2008 Mw 7.9 Wenchuan Earthquake, China
Authors:	張中白;Tan, Xi-bin;Yuan, Ren-mao;Xu, Xi-wei;Chen, Gui-hua;Klinger, Yann;Chang, Chung-Pai;Ren, Jun-jie;Xu, Chong;Li, Kang
Contributors:	太空及遙測研究中心
Keywords:	Co-seismic rupture;Mechanical model;Sciences of the Universe;Wenchuan earthquake;Xiaoyudong stepover
Date:	2012-09-30
Issue Date:	2026-04-21 14:22:53 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： ► The Xiaoyudong fault replaces the absent segment of the Beichuan-yingxiu fault in the Xiaoyudong area. ► A restraining step-over exists in the Xiaoyudong area. ► Stress along the Pengguan fault face doubles due to dip angle change. ► We discussed the mechanism of two faults being ruptured simultaneously. The large oblique reverse slip shock of the 2008 Mw=7.9 Wenchuan earthquake, China, produced one of the longest and most complicated surface ruptures ever known. The complexity is particularly evident in the Xiaoyudong area, where three special phenomena occurred: the 7km long Xiaoyudong rupture perpendicular to the Beichuan-Yingxiu fault; the occurrence of two parallel faults rupturing simultaneously, and apparent discontinuity of the Beichuan-Yingxiu rupture. This paper systematically documents these co-seismic rupture phenomena for the Xiaoyudong area. The discussion and results are based on field investigations and analyses of faulting mechanisms and prevalent stress conditions. The results show that the Beichuan-Yingxiu fault formed a 3.5km wide restraining stepover at the Xiaoyudong area. The Xiaoyudong fault is not a tear fault suggested by previous researches, but a frontal reverse fault induced by the oblique compression at this stepover; it well accommodates the ‘deformation gap’ of the Beichuan-Yingxiu fault in the Xiaoyudong area. Further, stress along the Peng-Guan fault plane doubles due to a change in dip angle of the Beichuan-Yingxiu fault across the Xiaoyudong restraining stepover. This resulted in two faults rupturing the ground’s surface simultaneously, to the north of the Xiaoyudong area. These results are helpful in deepening our understanding of the dynamic processes that produced surface ruptures during the Wenchuan earthquake. Furthermore, the results suggest more attention be focused on the influence of dextral slip component, the change of the control fault’s attitude, and property differences in rocks on either side of faults when discussing the formation mechanism of surface ruptures. 出版者： Elsevier Ltd 出版日期： 2012-09-30 出處： Journal of Asian earth sciences, 2012-09, Vol.58, p.132-142 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2012 Elsevier Ltd 版權： licence_http://creativecommons.org/publicdomain/zero 識別號： ISSN: 1367-9120 識別號： EISSN: 1878-5786 識別號： DOI: 10.1016/j.jseaes.2012.06.005
Appears in Collections:	[Center for Space and Remote Sensing Research ] journal & Dissertation

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