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Complexity of the coseismic rupture for 1999 Chi-Chi Earthquake(Taiwan) from inversion of GPS observations

Wei-min Wang~*;Yu-mei He;Zhen-xing Yao Institute of Geology and Geophysics;CAS;Beijing;China

  Based on the elastic half-space model and the layered-earth model,we use Global Position System observations to invert the distribution of coseismic slip along the Chi-Chi earthquake rupture.Bending fault planes arc introduced in our models.The results indicate that the shear slip model can not fit horizontal and vertical coseismic displacements simultaneously,unless the fault-normal motion(tensile component) is considered in the inversion.We interpret that the fault-nonnal motion reflects theroughness of fault planes,demonstrating the complexity of the rupture in property and geometry.The distribution of the fault-normal motion appropriately fits with the complexity of surface coseismic rupture from the field invcstigation,and the distribution of the strike-dip slip of coseismic rupture is similar to the results from inversion of the teleseismic data.……