期刊
GEOPHYSICAL RESEARCH LETTERS
卷 39, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2012GL052516
关键词
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资金
- Chinese National Science Foundation [41111140386]
- Basic Scientific Funding of Institute of Geology, China Earthquake Administration [IGCEA1202]
- Geoazur laboratory (Nice, France, Internal BQR)
We investigate the rupture process of the 12 May 2008 Wenchuan earthquake using the records of 26 strong-motion stations, located 20-120 km from the seismic fault and with a good azimuthal coverage. The wave velocity model required to conduct this analysis has been validated against aftershocks, for which the point source hypothesis is a very good approximation. The inversion of the main shock rupture process confirms the slip distribution and the average rupture velocity (similar to 3 km/s) previously determined. However, a very peculiar behavior is clearly resolved by the extensive data set used in this study: the major slip area of the Wenchuan earthquake, located at 20-50 km North-East of the epicenter, is shown to break almost simultaneously, 25 s after earthquake initiation. This implies that slip in this part of the fault cannot be understood by simple stress release at the rupture front. A more likely interpretation is the presence of a strong asperity, which could break only when it was completely surrounded by stress increase, resulting in a delayed but brutal rupture. Citation: Zhang, G., M. Vallee, X. Shan, and B. Delouis (2012), Evidence of sudden rupture of a large asperity during the 2008 Mw7.9 Wenchuan earthquake based on strong motion analysis, Geophys. Res. Lett., 39, L17303, doi:10.1029/2012GL052516.
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