λ????????????????????«?Ms7.0?????е????

????????????????Χ??????????????????????????????????????????????????????????????????????????????????????λ??????????Ms7.0?????????о??????????????????λ????????????????????о??仯???仯??4?????????У???????????????????λ???????????????????????????????????40%???????JP2????????????????????????????????“?????”?????????????????????????????λ??????????????????20~30%??

High Accurate Computation of Green Functions for Coseismic Displacements and Its Application to the Lushan Ms7.0 Earthquake

In this paper we introduce a method that rebuilds a layered earth model according to the real structures of the crustal and upper mantle around the epicenter. Further, we modify the computing codes for displacement Green functions (DGFs) based on the above newly-built layered earth model. The new codes can calculate more suitable DGFs for the objective earthquake, therefore providing us with higher-accuracy coseismic displacements. The case study of the Lushan Ms7.0 earthquake shows that the effects of earth model on vertical DGFs change with the variation of epicentral distance. Among the four independent dislocations, the effects of the earth model on the opening tensile at a horizontal plane are biggest, up to 40% of the DGF themselves in the near field. JP2]After modifying the computing codes for DGFs according to the real structure in west Sichuan(call it “Lushan model” in this paper), we improve the accuracy of coseismic displacements in the near field by 20%-30% in total.