In-situ hydro-fracture stress measurement before and after the Wenchuan Ms8. 0 earthquake of China

被引:44
作者
Guo Qi-Liang [1 ]
Wang Cheng-Hu [1 ]
Ma Hong-Sheng [2 ]
Wang Chong-Gen [3 ]
机构
[1] CEA, Inst Crustal Dynam, Beijing 100085, Peoples R China
[2] Sichuan Commun Dept, Inst Highway Planning & Designing, Chengdu 610041, Peoples R China
[3] China Railway Co Ltd, Surveying & Designing Inst 2, Chengdu 610043, Peoples R China
来源
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION | 2009年 / 52卷 / 05期
关键词
Wenchuan earthquake; Before earthquake; After earthquake; Longmenshan faults; In-situ stress measurement with hydrofracturing method; FAULT;
D O I
10.3969/j.issn.0001-5733.2009.05.029
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
One week before the occurrence of Wenchuan M(s)8.0 earthquake the maximum horizontal principal stress measured by hydro-fracturing technique in the earthquake Fault of Wenchuan Earthquake (Yingxiu-Beichuan fault) at +/- 400 in depth was 21 similar to 22 MPa, which was 8 similar to 10 MPa higher than the values measured in the nearby footwall. The repeated measurements after the great earthquake at the same locations indicate that the maximum and minimum horizontal principal stress in the fault belt decreased by 29% and 23% respectively; while in the footwall the stresses did not change after the earthquake. The analysis of the measured result indicates that anomalous high stress in an active fault belt provides a reliable basis for determining the area of high seismic risk, and it is a warning sign of generation and occurrence of strong earthquakes.
引用
收藏
页码:1395 / 1401
页数:7
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