2015年尼泊尔地震M_w7.9产生的地球内部变形

The inner deformation in the Earth caused by the 2015 Nepal earthquake M_w7.9

针对地球内部变形的理论研究缺失,该文基于半无限空间的地球模型,研究了2015年尼泊尔地震Mw7.9产生的地球内部不同深处(地表以及地下10、20、30、50、100和300km)的同震位移变化,研究区域内的地表最大垂直位移有0.779 0m,向下的最大垂直位移是-0.383m,南北向的水平位移在断层处产生集中挤压,最大值有1.460 0m,这与尼泊尔境内的GPS观测结果比较吻合;地下10km处的位移比地表的变形要大很多;地球深部的位移结果逐渐变小,并且100km处的水平位移方向也发生了巨大变化。地球内部位移变化结果显示:地球浅部位移与地表的走向趋势一致但振幅不同,地表的位移并不是最大的,接近震源处的变形最大。

According to the lack of the research on the inner deformation in the Earth,this paper studied the inner coseismic displacements in the Earth(surface and below at 10,20,30,50,100 and 300 km)caused by the 2015 Nepal earthquake Mw7.9 based on the half-space Earth model.The max vertical displacement was 0.779 0 mand the maximum downward displacement was-0.383 min the study area.The horizontal displacements were concentrated on the finite fault,the maximum was 1.460 0 m,which is agree well with the GPS data.The displacements at 10 km under the surface were bigger than the surface.The displacements decrease with the depth in the Earth,the directions of the horizontal displacements at 100 km had changed a lot.The results of the inner deformation indicate the trends of the displacements at shallow of the Earth were same as the surface,but the amplitude was different.The deformation on the surface was not the largest,but which around the epicenter.