摘要
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.
出处
《CT理论与应用研究（中英文）》
2011年第4期433-452,共20页
Computerized Tomography Theory and Applications
基金
中国地震局地壳应力研究所基本科研业务专项(ZDJ2010-01)
国家自然科学基金(41104026)
关键词
各向异性震源
P波远场辐射
震源球
非双力偶机制
标量地震矩
anisotropic source
far-field P-wave radiation
focal sphere
non-double-couplemechanism
scalar moment
