科研成果
  当前位置:首页 > 科研成果 > 论文
Three-dimensional seismic velocity structure across the 2008 Wenchuan Ms 8.0 earthquake, Sichuan, China
作者: S. P. Pei, J. R. Su, H. J. Zhang, Y. S. Sun, M. N. Toksoz, Z. Wang, X. Gao, L. Z. Jing and J. K. He
期刊名称: Tectonophysics
发表年度: 2010
卷: 491
期: 1-4
联系作者:
页码: 211-217
摘要: We present three-dimensional (3D) seismic compressional wave velocity (V(p)), shear wave velocity (V(s)) and V(p)/V(s) models around the Longmen Shan fault, Sichuan, China region, using aftershocks associated with the 2008 Wenchuan Ms 8.0 earthquake. The velocity and ratio models are obtained using a new version of the double-difference seismic tomography code tomoDDPS (Zhang, 2003) to simultaneously solve for V(p), V(s), V(p)/V(s) and event locations. The data used in inversion include 73,013 P arrival times, 62,287 S arrival times and 61,823 S-P travel times recorded by 63 stations from both permanent and temporary networks in a region 400 km northeast-southwest by 200 km northwest-southeast. The velocity model shows structure heterogeneity both along and across the fault zone. Generally, the velocity model is consistent with the local geology, with older rocks having high velocity and younger rocks having low velocity. The Longmen Shan fault zone is a clear boundary in V(p), V(s), and V(p)/V(s) ratio. Down to the depth around 15 km, higher V(p) and V(s) and lower V(p)/V(s) ratio exist to the west of the fault, corresponding to the Songpan-Ganze Fold System, while lower V(p) and V(s) and higher V(p)/V(s) ratio exist to the east, corresponding to the Sichuan Basin. Along the fault zone, the velocity structure is generally consistent with various rupture slip models, with two high velocity bodies corresponding well to the two large slip patches. This shows the structure control on the slip distribution along the fault plane. (C) 2009 Elsevier B.V. All rights reserved.

版权所有:中国科学院青藏高原研究所 Copyright © 2003-
通讯地址:北京市朝阳区林萃路16号院3号楼 邮政编码:100101
京ICP备05002818-1号 京公网安备110402500031号