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首页> 外文会议>International Symposium on Earth Hazard and Disaster Mitigation >Detailed Seismotectonic Analysis of Sumatra Subduction Zone revealed by High Precision Earthquake Location
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Detailed Seismotectonic Analysis of Sumatra Subduction Zone revealed by High Precision Earthquake Location

机译：高精度地震定位展示苏门答腊俯冲区的详细地震局部分析

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Sumatra was one of the most high seismicity regions in Indonesia. The subduction of Indo-Australian plate beneath Eurasian plate in western Sumatra contributes for many significant earthquakes that occur in this area. These earthquake events can be used to analyze the seismotectonic of Sumatra subduction zone and its system. In this study we use teleseismic double-difference method to obtain more high precision earthquake distribution in Sumatra subduction zone. We use a 3D nested regional-global velocity model. We use a combination of data from both of ISC (International Seismological Center) and BMKG (Agency for Meteorology Climatology and Geophysics, Indonesia). We successfully relocate about 6886 earthquakes that occur on period of 1981-2015. We consider that this new location is more precise than the regular bulletin. The relocation results show greatly reduced of RMS residual of travel time. Using this data, we can construct a new seismotectonic map of Sumatra. A well-built geometry of subduction slab, faults and volcano arc can be obtained from the new bulletin. It is also showed that at a depth of 140-170 km, there is many events occur as moderate-to-deep earthquakes, and we consider about the relation of the slab's events with volcanic arc and inland fault system. A reliable slab model is also built from regression equation using new relocated data. We also analyze the spatial-temporal of seismotectonic using b-value mapping that inspected in detail horizontally and vertically crosssection.
机译：苏门答腊是印尼最高地震区之一。印度 - 澳大利亚板块的西部苏门答腊有助于对发生在这一领域的许多显著地震欧亚板块下方俯冲。这些地震事件可以用来分析地震构造苏门答腊俯冲带及其系统。在这项研究中，我们使用的远震双差法获得苏门答腊俯冲带更高精度的地震分布。我们使用3D嵌套的区域 - 全球速度模型。我们使用来自ISC（国际地震中心）和BMKG的数据（局气象气候和地球物理，印度尼西亚）的组合。我们成功地搬迁约6886对1981至2015年期间发生的地震。我们认为，这个新的位置比普通公告更精确。搬迁。结果表明大大简化RMS剩余的行程时间。利用这些数据，我们可以构造苏门答腊的地震构造新地图。俯冲板，断层和火山弧的精心打造的几何形状可以从新的公告中获得。它也表明，在140-170公里的深度，有许多事件发生中度到深源地震，我们认为对板与火山弧和内陆断层系统事件的关系。一个可靠的平板模型也从回归方程使用新的重定位数据构建的。我们还分析了空间 - 时间，在详细检查水平和垂直截面地震构造使用b值映射。

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