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首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Three-Dimensional S Wave Velocity Structure of Central Japan Estimated by Surface-Wave Tomography Using Ambient Noise
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Three-Dimensional S Wave Velocity Structure of Central Japan Estimated by Surface-Wave Tomography Using Ambient Noise

机译：中央日本的三维S波速结构采用环境噪声估计的表面波断层扫描

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摘要

Many significant geological features in central Japan reflect the history of tectonic events such as volcanic eruptions, fault ruptures, and the collision of the Izu-Bonin arc. Because most previous studies focused on deep, large-scale structures at relatively low resolution or on local structures using high-resolution data (e.g., active source seismic data), tectonic structures over a wide area throughout central Japan have not been characterized in detail. In this study, we estimated 3D S wave velocity structures with high spatial resolution by extracting surface waves from 1-year-long ambient seismic data recorded by the Hi-net high-sensitivity seismograph network. We computed cross spectra of ambient noise data between station pairs and then extracted phase velocity dispersion curves using a frequency domain method. We developed an algorithm to calculate phase velocity and obtained numerous dispersion data. We then estimated the 3D S wave velocity structure by applying a direct surface-wave inversion method. Our results clearly mapped heterogeneous features such as tectonic lines, sedimentary plains, and volcanic systems. We observed some low-velocity anomalies below volcanoes. Active fault zones identified as low-velocity zones were consistent with features on seismic reflection profiles. Several geological blocks that are related to the Izu collision were observed around the Izu Peninsula. We observed previously unreported geological features of the island of Honshu. Our high-resolution S wave velocity model can be used for not only interpretation of geological structures but also hazard assessment of earthquake.
机译：日本中部的许多重要地质特征反映了构造事件的历史，如火山喷发，故障破裂，以及Izu-Bonin弧的碰撞。因为最先前的研究专注于使用高分辨率数据（例如，主动源地震数据）的相对较低的分辨率或局部结构的深度，大规模结构，因此在日本中部中部的广域地区的构造结构尚未详细描述。在该研究中，通过从高网高灵敏度地震仪网络记录的1年长的环境地震数据中提取表面波来估计具有高空间分辨率的3D S波速度结构。我们使用频域方法计算了站对之间的环境噪声数据的横梁，然后用频域方法提取相位速度色散曲线。我们开发了一种计算阶段速度并获得了许多色散数据的算法。然后，我们通过施加直接表面波反演方法来估计3D S波速度结构。我们的结果清楚地映射了外侵的功能，如构造线，沉积平原和火山系统。我们观察了火山以下一些低速异常。识别为低速区域的主动断层区域与地震反射型材的特征一致。在伊豆半岛周围观察到与Izu碰撞有关的几个地质块。我们观察到了本湖岛岛上的先前未报告的地质特征。我们的高分辨率S波速度模型不仅可以用于地质结构的解释，而且用于对地震的危害评估。

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