提出了一种研究二维弹性动力学散射问题的边界元法 .其中 ,散射体或侵入体散射场以Huygens原理积分形式表达 ,虚拟场源以适配边界条件来求取 .该间接边界元法可以高精度计算包括多次散射在内的全波场 .通过对不同空间与尺度分布裂缝所诱导的地震波散射数值计算表明 :该方法具有计算多次散射波场的能力 ;尾波 (多次散射波 )频率及延续长度受控于裂缝位置及尺度 ;等效介质弹性参数受控于散射体不同的统计分布 A boundary element method is proposed to study the two-dimensional elastic-dynamic scattering problem, in which the scatterer or invader scattering field is expressed by Huygens principle integral and the virtual field source is obtained by fitting the boundary conditions. The indirect boundary element method The full-wave field including multiple scattering can be calculated with high precision.The numerical simulation of seismic wave scattering induced by different spatial and scale fractures shows that this method has the ability of calculating multiple scattering wavefields; the coda wave (multiple scattering Wave) frequency and continuation length are controlled by the location and scale of the fracture; the elastic parameters of the equivalent medium are controlled by different statistical distributions of scatterers