Ambient tectonic shear stress field in Southern California and seismic hazard regions |
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| Authors: | Pei-Shan Chen Lei Xiao Tong-Xia Bai and Jin Cheng |
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| Institution: | (1) Institute of Geophysics, State Seismological Bureau, 100081 Beijing, China |
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| Abstract: | According to the fracture mechanics rupture model of earthquakes put forward by us, several equations to compute tectonic
ambient shear stress value τ0 have been derived equations (1), (2), (3), (5)]. τ0 values for intermediate and small earthquakes occurred in Chinese mainland and Southern California have been calculated by
use of these equations. The results demonstrate that the level and distribution of τ0 are closely related to the location where large earthquakes will occur, i.e. the region with higher level of τ0 will be prone to occur large earthquakes and the region with lower level will usually occur small earthquakes. According
to the spatial distribution of τ0, the seismic hazard regions or the potential earthquake source regions can in some degree be determined. According to the
variation of τ0 with time, the large earthquake occurrence time can be roughly estimated. According to the distribution of τ0 in Southern California and variation with time, three high stress level regions are determined, one (Goldfield area) of them
is the present seismic hazard region.
Contribution No. 98A02023, Institute of Geophysics, State Seismological Bureau, China |
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| Keywords: | tectonic ambient shear stress field Southern California seismic hazard region potential earthquake source region |
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