科研之友
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摘要
An investigated lump method based on the mixed mesh of triangle and quadrangle for simulating near-fault ground motion is presented by using finite-fault sources and a differential type of viscoelastic constitutive equations of the generalized zener body (GZB) with two mechanisms. One numerical test is performed to verify the validity and accuracy of the investigated lump method. The ground motion in Beichuan town during the Wenchuan earthquake is simulated, considering attenuation of real earth material and the effect of realistic topography. Numerical results of simulations demonstrated that the viscoelasticity of earth medium attenuates the PGAs noticeably and changes the frequency characteristics of the ground motion. The local topography influences greatly the PGAs in the area of Beichuan town.
