• 责任者：Wan Yongge (Institute of Disaster Prevention Science and Technology ; Sanhe 065201 ; China) ; Shen Zhengkang
• 刊名：Acta Seismologica Sinica
• 出版年：2009
• 卷期：31(2)
• 关键词：汶川地震2008 ; Wenchuan earthquake 2008 ; 断裂带 ; fracture zones ; 龙门山断裂带 ; Longmenshan Fault Zone ; 鲜水河断裂带 ; Xianshuihe Fault Zone
• 页码：p.128-139
• 图表：3 illus., 2 tables, 52 refs.
• 分类号：0500
• issnNo：ISSN0253-3782
• isbnNo：CN11-2021/P

The 12 May 2008 M_W 7.9 Wenchuan earthquake has changed the regional tectonic stress field significantly. It is important to know how such a change affects the tectonic loading process on regional faults and thenceforth the seismic potential of the region. Utilizing the slip distribution of the Wenchuan earthquake as the driving source, the authors computed the Coulomb stress changes on the neighborhood faults. The result shows that the Coulomb stress has increased on northern and southern end of the Longmenshan, the southernmost Xianshuihe, East Kunlun, Longxian-Baoji, Elashan, Baiyu, southernmost Riyueshan, central segment of the Mabian-Yanjin, western segment of the Bangongcuo-Jiali, and Zemuhe fault. Most significant increases of the Coulomb stress are: 0.01 MPa and 0.03 MPa at southern and northern end of the Longmenshan fault, 0.03 MPa on western segment of the Qinling Southern Frontal fault, 0.007 MPa at southeast end of the East Kunlun fault, 0.005 MPa on the southernmost Xianshuihe fault, 0.004 MPa on the Tianshui-Baoji segment of the West Qinling Northern Frontal fault, and 0.003 MPa in Longxian-Baoji fault zone. The earthquake also decreased the Coulomb stress on the Longriba, Nujiang, western segment of the Qinling Northern Frontal, Zhuanglanghe, Haiyuan, Minjiang, and Yushu-Maqu fault. Large relaxation occurred on the ruptured part of the Longmenshan, Minjiang, and Luhuo segment of the Xianshuihe fault, with the Coulomb stress reduction ranging 0.04~0.7 MPa, 0.001~0.1 MPa and 0.008~0.01 MPa, respectively. The Coulomb failure stress projected on fault plane of the Xiaojinhe, Anninghe and Xiaojiang fault is nearly zero, indicating no significant influence of the Wenchuan earthquake on these faults.