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剪切位错震源和张裂震源在辐射意义上均可用等效体力来描述,在Burridge和Knopoff以及Aki和Richards工作的基础上,推导了均匀任意各向异性介质震源在辐射意义上所对应的等效体力,讨论了由此衍生的地震矩、应力降和AMR等问题。结果表明,当震源区为任意各向异性介质时,剪切位错源一般不等效为双力偶力系,只有满足如下条件之一时剪切位错源才等效为双力偶系,震源区为各向同性介质时,或者震源区为某些特定各向介质时,如对称轴垂直于断层面的TI介质。此外,还引入了各向异性标量地震矩的概念。各向异性震源的研究提供了震源区更丰富的信息。
Shear dislocation sources and fracture sources can all be described by equivalent physical forces in the sense of radiation. Based on the work of Burridge and Knopoff and Aki and Richards, the radiation-induced responses of a uniformly anisotropic media source Equivalent physical strength, discussed the resulting seismic moment, stress drop and AMR and other issues. The results show that when the source region is an anisotropic medium, the shear dislocation source is not equivalent to a dual couple system. The shear source is equivalent to a dual force couple only if one of the following conditions is satisfied: the source region Isotropic medium, or the source area for some specific media, such as the axis of symmetry perpendicular to the fault plane TI media. In addition, the concept of anisotropic scalar seismic moment is also introduced. The study of anisotropic sources provided richer information in the source area.