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首页> 外文期刊>Pure and Applied Geophysics >Crustal Heterogeneity in the Source Region of the 2004 Mid Niigata Prefecture Earthquake: Inversion Analysis of Coda Envelopes
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Crustal Heterogeneity in the Source Region of the 2004 Mid Niigata Prefecture Earthquake: Inversion Analysis of Coda Envelopes

机译：2004年新泻县中地震震源区的地壳非均质性：尾气包膜的反演分析

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摘要

The 2004 Mid Niigata Prefecture earthquake (M JMA 6.8) and its aftershock sequences generated complicated, i.e., several conjugate fault planes in their source region. In order to understand the generating process of these earthquakes, we estimated a 3-D distribution of relative scattering coefficients in the source region. The large slip area during the main shock rupture seems to be bounded by strong heterogeneous zones with larger scattering coefficients. Hypocenters of the main shock and major large aftershocks with M 5-6 classes tend to be located close to stronger scattering areas. We found that one of these strong heterogeneities already existed before the occurrence of the M 5.9 aftershock on November 8. We suppose that heterogeneous structures in the source region of this earthquake sequence affected the initiation and growth of ruptures of the main shock and major large aftershocks.
机译：2004年新泻县中部地震（M JMA 6.8）及其余震序列在其震源区产生了复杂的，即数个共轭断裂面。为了了解这些地震的产生过程，我们估算了震源区相对散射系数的3-D分布。在主震破裂过程中，较大的滑动面积似乎受到具有较大散射系数的强异质性区域的限制。 M 5-6级的主震和大余震的震源往往位于更强的散射区域附近。我们发现这些强烈的非均质性之一已在11月8日M 5.9余震发生之前就已经存在。我们假设该地震序列震源区的非均质结构影响了主震和大余震破裂的发生和发展。 。

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