Abstract:Based on the lock in the shearing force model and seismic dislocation theory, we describe the lock in shearing force of the earthquake as an equivalent dislocation. We build the mathematical relationship between lock in shearing force and the surface gravity. Considering the rough-difference interference, we use robust-Bayesian least squares inversion to obtain the parameters of equivalent dislocation. The inversion results show that the seismogenic type is high dip angle strike-slip, and that the seismogenic energy is close to the Yao’an earthquake moment magnitude provided by USGS. It proves that this method can be applied to predict the future focus characteristics and seismogenic magnitude with the four-quadrant gravity image before an earthquake.
HUANG Haozhe,SHEN Chongyang,TAN Hongbo et al. Quantitative Research on the Seismic Model of Typical Gravity Precursors in Yao’an MS6.0 Earthquake[J]. jgg, 2019, 39(4): 351-355.