Anisotropy affects the focal mechanism and makes it complicated. A shear motion generates a pure double-couple (DC) source in isotropic media. While in anisotropic media, it will produce non-DC components, which contain isotropic (ISO) and compensated linear vector dipole (CLVD) components. Besides, coupled with the diversity of fault motion, the source may become extremely complicated. In this paper, the seismic moment tensor is obtained based on the dislocation model, and then a variety of analyses are performed with the moment tensor, including moment tensor decomposition, radiation pattern, radiated energy ratio and seismic propagation characteristics. Since the anisotropy of the medium also influences seismic wave propagation, a hypothesis is made that the source region is minimal and anisotropic, but the propagation path is isotropic. The research gives some interesting conclusions. It is found that the anisotropy mainly affects the focal mechanism under low slope angle while high slope angle has little effect on the polarity. In terms of the moment tensor decomposition, if only one of ISO or CLVD exists, it can be asserted that the source region is anisotropic because ISO components are accompanied by CLVD components in isotropy media. As for the DC component, the results indicate it is one of the most important factors for determining the ratio of radiant energy. This paper presents some valuable findings of the focal mechanism of the general dislocation source under anisotropy, which helps to recognise the source characteristics of the earthquake and build solid foundations for the subsequent inversion of the focal mechanism.

中文翻译：

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基于一般位错源模型的各向异性介质地震辐射分析

各向异性影响焦点机制并使其复杂化。剪切运动在各向同性介质中产生纯双耦合 (DC) 源。在各向异性介质中，它将产生非直流分量，其中包含各向同性 (ISO) 和补偿线性矢量偶极子 (CLVD) 分量。此外，加上断层运动的多样性，其来源可能会变得极为复杂。本文基于位错模型得到地震矩张量，然后利用矩张量进行各种分析，包括矩张量分解、辐射方向图、辐射能量比和地震传播特性。由于介质的各向异性也会影响地震波的传播，因此假设震源区域最小且各向异性，但传播路径是各向同性的。该研究给出了一些有趣的结论。发现各向异性主要影响低倾角下的焦点机制，而高倾角对极性影响不大。就矩张量分解而言，如果只存在 ISO 或 CLVD 之一，则可以断言源区域是各向异性的，因为 ISO 分量在各向同性介质中伴随有 CLVD 分量。至于直流分量，结果表明它是决定辐射能量比的最重要因素之一。本文介绍了各向异性下一般位错源震源机制的一些有价值的发现，有助于认识地震的震源特征，为后续震源机制的反演奠定坚实的基础。发现各向异性主要影响低倾角下的焦点机制，而高倾角对极性影响不大。就矩张量分解而言，如果只存在 ISO 或 CLVD 之一，则可以断言源区域是各向异性的，因为 ISO 分量在各向同性介质中伴随有 CLVD 分量。至于直流分量，结果表明它是决定辐射能量比的最重要因素之一。本文介绍了各向异性下一般位错源震源机制的一些有价值的发现，有助于认识地震的震源特征，为后续震源机制的反演奠定坚实的基础。发现各向异性主要影响低倾角下的焦点机制，而高倾角对极性影响不大。就矩张量分解而言，如果只存在 ISO 或 CLVD 之一，则可以断言源区域是各向异性的，因为 ISO 分量在各向同性介质中伴随有 CLVD 分量。至于直流分量，结果表明它是决定辐射能量比的最重要因素之一。本文介绍了各向异性下一般位错源震源机制的一些有价值的发现，有助于认识地震的震源特征，为后续震源机制的反演奠定坚实的基础。