汶川8级大地震的地表破裂特征及分段

Abstract

Abstract: Detailed field investigation showed that three seismogenic faults ruptured in the Wenchuan M_S8.0 earthquake, which are Beichuan-Yinxiu fault, Penxian-Guanxian fault, and Xiaoyudong fault. The Beichuan-Yinxiu fault is characterized by reverse faulting in the south and right-lateral faulting in the north, which lasted for 220 km long and vertically displaced 3 meters on average, and can be divided into three segments. The Penxian-Guanxian fault rupture is characterized by reverse faulting which is 5.6 km long and vertically displaced 1.5 meters on average, and can be divided into two segments. Xiaoyudong secondary fault is characterized by tear faulting and was formed in this earthquake, left-laterally faulted 5.6 km long with 1.5 m vertical displacement on average, which accommodated the different deformations of tectonic units on both side. The surface rupture on Yaodu town may show the different characteristics between Nanba segment and Beichuan segment. The geometry and motion mode indicate that the maximum horizontal main stress in this region is in the direction of NWW.

Key words: Wenchuan M_S8.0 earthquake, Faulting, Surface rupture, Segmentation

CLC Number:

P315.7

ZHANG Jun-long, SHEN Xu-hui, XU yue-ren, PAN Xing-yang. Surface Rupture Features and Segmentation of the M_S8.0 Wenchuan Earthquake[J]. EARTHQUAKE, 2009, 29(1): 149-163.

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Surface Rupture Features and Segmentation of the M_S8.0 Wenchuan Earthquake

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Surface Rupture Features and Segmentation of the MS8.0 Wenchuan Earthquake

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Surface Rupture Features and Segmentation of the M_S8.0 Wenchuan Earthquake