Theoretical analysis of the spatio-temporal evolution of the bulk-strain field based on a rheologic inclusion model |
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| Authors: | SONG Zhi-ping YIN Xiang-chu MEI Shi-rong Beijing Seismological Bureau Beijing China Center for Analysis and Prediction China Seismological Bureau Beijing China |
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| Institution: | (1) Beijing Seismological Bureau, 100080 Beijing, China;(2) Center for Analysis and Prediction, China Seismological Bureau, 100036 Beijing, China |
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| Abstract: | Based on the theoretical expression of the three-dimension rheologic inclusion model, we analyze in detail the spatio-temporal changes on the ground of the bulk-strain produced by a spherical rheologic inclusion in a semi-infinite rheologic medium. The results show that the spatio-temporal change of bulk-strain produced by the hard inclusion has three stages of different characteristics, which are similar to most of those geodetic deformation curves, but those by a soft inclusion do not. The (-stage is a long stage in which the precursors in both the near source region and the far field develop from the focal region to the periphery. The (-stage indicates a very rapid propagation of the precursors, so that they almost appear everywhere. During the (-stage, the precursors in the far-field converge from the periphery, and the precursors in the near source region develop outwards. The theoretical results have been used to explain tentatively the stage characteristics of the spatio-temporal change of earthquake precursors. |
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| Keywords: | elastic inclusion theory rheologic inclusion model strong body earthquake generating model earthquake precursor |
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