双相介质中的地震波运动学特征

THE KINEMATIC CHARACTERISTICS OF SEISMIC WAVES IN TWO PHASE MEDIA

以 Biot理论为基础 ,推导了双相介质中弹性波的本构关系、运动方程及解。结果表明 :在均匀双相介质中可获得第一 P波、第二 P波和 S波。第一 P波近似于弹性介质中的 P波 ,第二 P波称为慢波 ,其速度一般小于 S波 ,但在个别介质模型中大于 S波。选择了合理的参数 。

Based on Biot theory, the constitution relation, the motion equation and its solution for seismic wave are derived in the isotropic twophase media. The results show that in the media there are three kinds of waves, the first P wave, the second P wave and S wave, among them the first P wave is similar to the P wave in elastic medium and the second P wave is called slower wave. Generally, V P 2 is smaller than V S but in some particular situation, V P 2 is larger than V S.