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首页> 外文期刊>Earth, planets and space: EPS >Waveform inversion for slip distribution of the 2006 Java tsunami earthquake by using 2.5D finite-difference Green's function
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Waveform inversion for slip distribution of the 2006 Java tsunami earthquake by using 2.5D finite-difference Green's function

机译：利用2.5D有限差分格林函数反演2006年爪哇海啸地震的滑动分布

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摘要

We first incorporate the large effect of near-source heterogeneity on teleseismic body waveforms in the inversion of the slip distribution of the 2006 Java tsunami earthquake. We incorporate the effect by computing the response of an assumed "2.5D" model structure of the Java trench by a 2.5D finite-difference method. Based on a simulation of inversion, we suggest that intense smearing is possible when we apply 1D Green's functions in the analysis, and that it may obscure the slip pattern. In the inversion of real data, we confirm macroscopic features, such as a long duration (～165 s) and a slow rupture velocity (～1.25 km/s). The region of the initial rupture is found to be isolated from the eastern broad region in which we further identify a heterogeneous slip distribution. Most of these regions are likely to be at the sedimentary plate interface where the accreted sediment and the subducting plate are in contact. In particular, the nearly ``isolated'' feature of a shallow slip region suggests a possible faulting in the shallowest part of the sedimentary plate interface without being strongly enforced by the rupture propagated from the deeper part of the fault. Such heterogeneity suggests a highly variable frictional behavior at the sedimentary plate interface.
机译：我们首先在2006年爪哇海啸地震的滑动分布反演中考虑了近源非均质性对远震体波形的巨大影响。我们通过使用2.5D有限差分方法计算Java沟槽的假定“ 2.5D”模型结构的响应来合并效果。基于反演的模拟，我们建议在分析中应用一维格林函数时可能会出现严重的拖尾现象，并且可能会使滑模模糊不清。在真实数据反演中，我们确认了宏观特征，例如持续时间长（约165 s）和破裂速度慢（约1.25 km / s）。发现初始破裂区域与东部广阔区域隔离，在该区域中我们进一步确定了非均质滑动分布。这些区域中的大多数可能位于沉积板界面，在此沉积的沉积物与俯冲板相接触。特别是，浅层滑动区域的近乎``孤立''的特征表明沉积板界面最浅部分可能存在断层，而没有被断层较深部分传播的破裂强烈地强迫。这种异质性表明沉积板界面处的摩擦行为高度可变。

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