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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 right-lateral 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-2in 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 the Institute of Geophysics, CEA and USGS. The results show that 1 ) the dislocation consists of dip slip and right-lateral 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. The results basically agreed with observational results.