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首页> 外文期刊>Earth, planets and space: EPS >Imaging of S-wave reflectors in and around the hypocentral area of the 2004 mid Niigata Prefecture Earthquake (M6.8)
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Imaging of S-wave reflectors in and around the hypocentral area of the 2004 mid Niigata Prefecture Earthquake (M6.8)

机译：2004年新泻县中震区及其附近震中的S波反射器成像（M6.8）

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摘要

An S -wave reflector is considered to relate to the existence of liquid in the seismogenic zone of the crust, which plays an important role in understanding the mechanism of earthquakes. We studied a distribution of S -wave reflectors in and around the hypocentral zone of the 2004 mid Niigata Prefecture Earthquake (M6.8). The earthquake was followed by several aftershocks that were greater than M6. Moreover, the aftershocks were not only located on the fault plane of the main shock but also on conjugate fault planes and on a parallel plane to that of the main shock. In order to discuss the relationship between this complex activity and the crustal heterogeneities, we analyzed the seismograms observed at the seismic stations in this region. Normal moveout processing (NMO) was applied to the data of the aftershock. Several S -wave reflectors could be identified from the NMO sections for every station. In particular, relatively strong S -wave reflectors exist in the lower crust at a depth of approximately 20-25 km in the middle part of the aftershock region. Additionally, reflectors were found beneath the fault planes of the main shock and the largest aftershock. This suggests a possibility of the correlation of the crustal heterogeneities to the occurrence of an earthquake.
机译：认为S波反射器与地壳的地震发生带中的液体的存在有关，这在理解地震机理中起着重要的作用。我们研究了2004年新泻县中部地震（M6.8）的震中及其附近的S波反射器分布。地震后发生了几次余震，强度大于M6。此外，余震不仅位于主震断层上，而且位于共轭断层上，并且位于与主震平行的平面上。为了讨论这种复杂活动与地壳非均质性之间的关系，我们分析了在该地区地震台站观测到的地震图。将普通时差处理（NMO）应用于余震数据。可以从NMO部分为每个站识别几个S波反射器。特别地，在余震区域的中部大约20-25 km的深度下地壳中存在相对较强的S波反射器。此外，在主震和最大余震的断层平面下方发现了反射器。这暗示了地壳非均质性与地震发生之间相关性的可能性。

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