各向异性ATI介质剪切位错点源P波远场辐射

Far-Field P-Wave Radiation Pattern from ATI Shear Dislocation:Theoretical Studies

假设震源区为ATI介质,传播介质为全空间各向同性介质情况下,给出了剪切位错源P波远场辐射解析表达式,讨论了震源区各向异性对远场P波振幅和震源球的影响。结果表明,震源区裂隙密度,裂隙方位等参数的动态变化导致P波远场辐射花样也随之动态变化,同时也会造成非双力偶百分含量的动态变化。研究认为,在井中对中小地震的非双力偶机制进行动态监测,也许是一个监测未来大地震的可能方法。

Suppose that source region is ATI medium and propagation path is isotropic media, analytical representations of far-field P-wave displacement and radiation are given and we discuss the effects of source anisotropy on far-field P-wave displacement and focal sphere. Some results show that crack density, azimuth et al. parameters play an important role in P-wave radiation and lead to non-double-earthquake mechanism. We propose that It maybe a good method which we can directly detect percentage of DC, CLVD and ISO for micro-earthquake before large earthquake in the well.