论文标题
一项关于异质性，各向异性和站点覆盖范围对深地震矩张量的补偿线性载体偶极子分量的影响的数值研究
A Numerical Study on the Effects of Heterogeneity, Anisotropy, and Station Coverage on the Compensated Linear Vector Dipole Component of Deep Earthquake Moment Tensors
论文作者
论文摘要
大量深层地震的时刻张量显示出明显的非双层（非DC）组件。以前，在深震中观察到的明显的非DC值归因于不同的机制，例如复杂的源过程或复杂的源介质结构。在本文中，我们专注于评估第二种机制。 We investigated the effect of slab heterogeneity, supra-slab anisotropic structure, intra-slab weakly anisotropic structure (e.g., the purported existence of the metastable olivine wedge), and non-uniform station coverage, on the non-DC radiation patterns of deep earthquakes using our 3-dimensional elastic finite-difference modeling and full-waveform inversion of moment tensors.我们发现，这些研究的问题不能引起观察到的非双偶辐射模式，而在地震焦点接近地震焦点附近具有强的S波各向异性的原位结构是说明深层地震辐射模式中明显的非DC成分的最简单方法。
The moment tensors of a large portion of deep earthquakes show apparent non-double-couple (non-DC) components. Previously, the observed apparent non-DC values in deep earthquakes have been attributed to different mechanisms such as complex source processes or complicated source medium structures. In this paper, we focused on evaluating the second mechanism. We investigated the effect of slab heterogeneity, supra-slab anisotropic structure, intra-slab weakly anisotropic structure (e.g., the purported existence of the metastable olivine wedge), and non-uniform station coverage, on the non-DC radiation patterns of deep earthquakes using our 3-dimensional elastic finite-difference modeling and full-waveform inversion of moment tensors. We found that these investigated issues cannot cause the observed non-double-couple radiation patterns and the in-situ structure with strong S-wave anisotropy near to the earthquake focus is the simplest way to account for the apparent non-DC components in the radiation patterns of deep earthquakes.
