谱元法数值模拟地表起伏对补偿线性矢量偶极源Rg波低谷点的影响

Investigation of surface fluctuation effects on the spectral null of Rg waves generated by CLVD source with Spectral Element Method simulation

利用谱元算法数值模拟了不同地表起伏模型下的补偿线性矢量偶极(Compensated Linear Vector Dipole,CLVD)源Rg波低谷点的特征及相应的震源深度.结果表明,源区地表存在一定起伏情况下,Rg波低谷点依然存在,低谷点位置反映了源区地表起伏的信息,但与理论值仍有一定偏差.Rg波低谷点受远区地表起伏影响较小.

The characteristics of the spectral null of Rg waves generated by CLVD source and the corresponding source depths are simulated numerically with Spectral Element Method under various fluctuation models. The results indicate that the spectral null of Rg waves still exists under certain conditions, and the location of the spectral null reflects the signatures of the surface fluctuation near the source. However, the depth calculated according to the spectral null still has a certain bias compared with the theoretical value. The fluctuant surface far from the source has little effect on the spectral null.