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首页> 外文期刊>Earth, planets and space: EPS >Full waveform moment tensor inversion by reciprocal finite difference Green's function
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Full waveform moment tensor inversion by reciprocal finite difference Green's function

机译：双向有限差分格林函数的全波形矩张量反演

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We study two important aspects of the waveform moment tensor inversion for the shallow earthquakes in the subduction region: the effect of the intense lateral inhomogeneity in the structure, and the strategy to invert the waveform data for the focal mechanisms. For the first aspect, using a forward finite difference modeling, we demonstrate that the effect of the inhomogeneity is quite large on the surface waves with a period of about 20s, and the current knowledge on the subduction region structure is practically effective in reproducing the characteristics in the observed waveforms. For the second aspect, we develop a reciprocal moment tensor inversion method that can generate the Green's functions for a large quantity of source locations (19,200 in this study) in a realistic inhomogeneous structure by only three finite difference calculations per a single station. The inversion with a grid search scheme result in a reasonable source location, moment tensor and fit of the waveforms using data from only two stations. The constraint on the epicenter in the "transverse" direction is found to be somewhat weak in the case of single-station inversions, but the two-station inversion improves the constraint.
机译：我们研究了俯冲区域浅层地震的波形矩张量反演的两个重要方面：结构中强烈的横向不均匀性的影响以及对震源机制的波形数据进行反演的策略。对于第一个方面，使用正向有限差分模型，我们证明了不均匀性对周期约为20s的表面波的影响非常大，并且有关俯冲带结构的最新知识在再现特征方面实际上是有效的在观察到的波形中。对于第二个方面，我们开发了一种互逆矩张量反演方法，该方法可以通过在每个单站仅进行三个有限差分计算来生成现实不均匀结构中大量源位置（本研究中为19,200）的格林函数。使用网格搜索方案的反演仅使用来自两个站的数据即可得出合理的源位置，矩张量和波形拟合。发现在单站反演的情况下，震中在“横向”方向上的约束有些弱，但是两站反演改善了约束。

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