THREE-DIMENSIONAL FINITE-DIFFERENCE MODELING OF GROUND MOTIONS IN BEIJING FROM A MW7 SCENARIO EARTHQUAKE

摘要

A three-dimensional velocity model in Beijing area is constructed. The model comprises four main velocity layers. A Mw7 scenario on the Shunyi-Qianmen-Liangxiang fault is simulated. The bi-lateral and uni-lateral slip source models are used. The ground velocities are predicted using both source models. As contrast, a flat layer velocity model is constructed by averaging the depth of each layer. By doing so, the amplification factors are calculated to examine the basin effect in Beijing. The results show that, although the source models are different, the amplification factors in the Beijing basin are as high as 1.5 to 2.0.