Simulation of co-seismic gravity change and deformation of Wenchuan Ms8.0 earthquake  

作　　者：Chongyang Shen Hui Li Hongbo Tan 

机构地区：[1]Institute of Seismology, China Earthquake Administration, Wuhan 430071, China [2]Crustal Movement Laboratory, Wuhan 430071, China

出　　处：《Geodesy and Geodynamics》2010年第1期8-14,共7页大地测量与地球动力学（英文版）

基　　金：supported by the National Natural Science Fundation of China(40574012)

摘　　要：Surface co-seismic gravity changes and displacements caused by the Wenchuan Ms8.0 earthquake are calculated on the basis of the half-space dislocation theory and two fault models inversed, respectively, by Institute of Geophysics, CEA and USGS. The results show that 1 ） the dislocation consists of dip slip and rightlateral strike slip ;2 ）the co-seismic gravity change shows a four-quadrant pattern ,which is greatly controlled by the distribution of the vertical displacements, especially in the near-filed ; 3 ） the gravity change is generally less than 10 × 10^-8 ms^-2 in the far-field,but as high as several 100 × 10^-8 ms^-2 in the near-filed. These results basically agree with observational results.Surface co-seismic gravity changes and displacements caused by the Wenchuan Ms8.0 earthquake are calculated on the basis of the half-space dislocation theory and two fault models inversed, respectively, by Institute of Geophysics, CEA and USGS. The results show that 1 ） the dislocation consists of dip slip and rightlateral strike slip ;2 ）the co-seismic gravity change shows a four-quadrant pattern ,which is greatly controlled by the distribution of the vertical displacements, especially in the near-filed ; 3 ） the gravity change is generally less than 10 × 10^-8 ms^-2 in the far-field,but as high as several 100 × 10^-8 ms^-2 in the near-filed. These results basically agree with observational results.

关 键 词：Wenchuan earthquake dislocation theory gravity change DEFORMATION SIMULATION 

分 类 号：P315.7[天文地球—地震学] P315.2[天文地球—固体地球物理学]