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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。
Under the assumption that the focal zone is ATI medium and the propagation medium is isotropic medium in the whole space, the analytical expression of P wave far-field radiation of shear dislocation source is given. The effects of source area anisotropy on the amplitude of far-field P wave and The impact of the source ball. The results show that the dynamic changes of the fission density and fracture orientation in the source region lead to the dynamic changes of the far-field radiation pattern of P-wave and the dynamic change of the non-dual-couple percentage. The study suggests that the dynamic monitoring of non-dual-couple mechanisms in the well may be a possible way to monitor future earthquakes.