横向各向同性介质中球腔震源激发的地震波

Seismic waves generated by spherical-cavity source in laterally isotropic medium.

迄今为止,作正演模拟多借助于各向同性介质中的解,很少见到有关横向各向同性介质中球腔震源激发地震波的讨论,而后者更有实际意义。本文不仅给出横向各向同性介质中球坐标状态下地震波势位函数的通解,而且具体分析了球腔震源激发产生地震波的特点。进一步证实,胀缩震源及剪切震源均可产生似P波、似SV波和似SH波,而且对应不同方位位移分量的势位函数彼此是耦合的。

So far, forward modeling usually draws support from the solution in isotropic medium. The seismic waves generated by spherical-cavity source in laterally isotropic medium are rarely discussed, which,however, are more significant in practice. We not only offer the general solutions of potential functions of seismic waves in laterally isotropic medium in the case of spherical coordinate system but also analyse the properties of the seismic waves generated by spherical-cavity source. We have confirmed that both the compressional source and the shear source can be expected to generate pseudo P-wave, pseudo SV-wave and pseudo SH wave, and that the potential functions corresponding to displacement components at different directions are coupling each other.