期刊
EARTHQUAKE SCIENCE
卷 27, 期 6, 页码 599-606出版社
SEISMOLOGICAL SOC CHINA & INST GEOPHYSICS, CHINA EARTHQUAKE ADMIN
DOI: 10.1007/s11589-014-0101-0
关键词
Wenchuan fault zone; Coseismic velocity change; Accurately Controlled Routinely Operated; Seismic Source (ACROSS); Active monitoring; Forward modeling
资金
- China Natural Scientific and Technological Support Projects (Wenchuan Fault Scientific Drilling)
- National Natural Scientific Foundation of China [41204047]
With the improvement of seismic observation system, more and more observations indicate that earthquakes may cause seismic velocity change. However, the amplitude and spatial distribution of the velocity variation remains a controversial issue. Recent active source monitoring carried out adjacent to Wenchuan Fault Scientific Drilling (WFSD) revealed unambiguous coseismic velocity change associated with a local M(s)5.5 earthquake. Here, we carry out forward modeling using two- dimensional spectral element method to further investigate the amplitude and spatial distribution of observed velocity change. The model is well constrained by results from seismic reflection and WFSD coring. Our model strongly suggests that the observed coseismic velocity change is localized within the fault zone with width of similar to 120 m rather than dynamic strong ground shaking. And a velocity decrease of similar to 2.0 % within the fault zone is required to fit the observed travel time delay distribution, which coincides with rock mechanical experiment and theoretical modeling.
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