COULOMB STRESS CHANGES CAUSED BY WENCHUAN EARTHQUAKE AND ITS INFLUENCE ON SEISMIC ACTIVITY IN THE ADJACENT AREAS

WANG Lian-jie; ZHOU Chun-jing; SUN Dong-sheng; WU Zhen-han; WANG Wei

2008 Vol. 14, No. 3

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WANG Lian-jie, ZHOU Chun-jing, SUN Dong-sheng, WU Zhen-han, WANG Wei. COULOMB STRESS CHANGES CAUSED BY WENCHUAN EARTHQUAKE AND ITS INFLUENCE ON SEISMIC ACTIVITY IN THE ADJACENT AREAS[J]. Journal of Geomechanics, 2008, 14(3): 193-200.

Citation:

COULOMB STRESS CHANGES CAUSED BY WENCHUAN EARTHQUAKE AND ITS INFLUENCE ON SEISMIC ACTIVITY IN THE ADJACENT AREAS

Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Received Date: 28 September 2008

Publish Date: 25 September 2008

Abstract

Abstract

On 12 May 2008, M8.0 Wenchuan earthquake occurred along the Longmenshan fault belt in Sichuan Province of China, causing enormous losses and thousands death, and the rearrangement of crustal stress commonly leads to damaging aftershocks.Coulomb stress changes caused by the Wenchuan earthquake are calculated and earthquake activity is evaluated using finite element method for some faults around the area.Results show that Coulomb stress displays a greater changes in northeast part of Longmeshan fault belt, including Beichuan, Qingchuan, Ningqiang areas and so on.Most of aftershocks of Wenchuan earthquake occurred in the area where the Coulomb stress change is increased. Coulomb stress gets weaker in most parts of Xianshueihe fault (b-1, b-2, b-4)except for some parts (b-3).It shows an increase to northwest of Chengdu, but a decrease to southeast of Chengdu.Coulomb stress increases can bring faults to failure, with delays ranging from seconds to decades.
- Wenchuan earthquake /
- Coulomb stress change /
- Longmenshan fault /
- finite element

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References

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