The characteristics of site seismic effect, the mainly factors of liquefied sandy soil and its dangers are discussed in the paper.

论述了场地地震效应的表现形式，影响砂土液化的主要因素和砂土液化危害的主要特点。

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Compared with the seismic responses of free homogeneous half space, the results present the effect of vertical cracks on the propagation of seismic wave and the ground motion near the fault site.

计算结果与均匀半空间自由场做了对比，以说明竖向地裂缝对地震波传播和附近地面运动的影响。

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