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首页> 外文期刊>Seismological research letters >High-Resolution Lithospheric Velocity Structure of Continental China by Double-Difference Seismic Travel-Time Tomography
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High-Resolution Lithospheric Velocity Structure of Continental China by Double-Difference Seismic Travel-Time Tomography

机译：双重差分地震行程 - 时断层扫描的大陆高分辨率岩性速度结构

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摘要

To determine high-resolution V-P and V-S models of the lithosphere of continental China, we assembled numerous highquality arrival-time data from 11,953 earthquakes recorded by the China Digital Seismic Network. Double-difference (DD) seismic tomography is applied to simultaneously determine earthquake locations and V-P andV(S) models. Two inversion grids with grid intervals of 1 degrees and 0.5 degrees are sequentially used. The inverted velocity models with the coarser grid are used as the initial models for the finer grid. For the inversion with the coarser grid, the 3D V-S model from ambient noise tomography and the converted V-P model based on an empirical relationship between V-P and V-S are used as the initial models. The checkerboard resolution test shows that with the current data configuration both V-P and V-S models down to 150 km have a spatial resolution of 1 degrees in the horizontal direction in most of continental China and up to 0.5 degrees in eastern China. The inverted velocity models are further validated by arrival times from active sources and surface-wave data. The V-P model is also consistent with that along the deep seismic sounding (DSS) profile. High-resolution V-P and V-S models of crust and upper mantle down to 150 km provide important constraints on tectonics beneath continental China. We name the inverted velocity models as USTClitho 1.0 (Unified Seismic Tomography models for continental China lithosphere) for easy reference. Overall, our tomographic images in the shallow crust correlate well with surface geology. In the deeper part, our velocity models show some well-known features, such as a low-velocity layer in the middle crust beneath the Tibetan plateau (TP) and a thin lithosphere beneath the North China craton.
机译：为确定中国大陆岩石岩层的高分辨率V-P和V-S模型，我们组装了中国数字地震网络记录的11,953次地震的众多高度高度到达时间数据。应用双差异（DD）震动术以同时确定地震位置和V-P和V（S）模型。顺序使用具有1度和0.5度的网格间隔的两个反转网格。具有粗栅格的倒速模型用作更精细电网的初始模型。对于较粗糙电网的反转，基于V-P和V-S之间的经验关系，使用来自环境噪声断层扫描的3D V-S模型和基于V-P和V-S之间的经验关系的初始模型。棋盘分辨率测试表明，随着当前数据配置，V-P和V-S型号下降到150公里的空间分辨率在大多数欧洲大陆的水平方向上的空间分辨率为1度，在中国的高达0.5度。倒置速度模型通过来自有源源和表面波数据的到达时间进一步验证。 V-P型号也与深层探测器（DSS）型材符合。地壳和上部地幔的高分辨率V-P和V-S型号降至150公里，为大陆下的构造提供了重要的制约因素。我们将倒速模型命名为USTCLitho 1.0（统一中国岩石圈的统一地震层析模型），以便于参考。总的来说，我们在浅地壳中的断层图像与地表地质相互作用。在更深的部分中，我们的速度模型显示了一些众所周知的特征，例如藏高高原（TP）下面的中地壳中的低速层，以及华北克拉顿下方的薄岩层。

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  • 来源
    《Seismological research letters》 |2019年第1期|共13页
  • 作者

    Xin Hailiang; Zhang Haijiang; Kang Min; He Rizheng; Gao Lei; Gao Ji;

  • 作者单位

    Univ Sci &

    Technol China Sch Earth &

    Space Sci Lab Seismol &

    Phys Earths Interior 96 Jinzhai Rd Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China Sch Earth &

    Space Sci Lab Seismol &

    Phys Earths Interior 96 Jinzhai Rd Hefei 230026 Anhui Peoples R China;

    China Earthquake Adm Geophys Explorat Ctr 75 Wenhua Rd Zhengzhou 450002 Henan Peoples R China;

    Chinese Acad Geol Sci China Deep Explorat Ctr Key Lab Earth Probe &

    Geodynam 26 Baiwanzhuang Ave Beijing 100037 Peoples R China;

    Univ Sci &

    Technol China Sch Earth &

    Space Sci Lab Seismol &

    Phys Earths Interior 96 Jinzhai Rd Hefei 230026 Anhui Peoples R China;

    Univ Sci &

    Technol China Sch Earth &

    Space Sci Lab Seismol &

    Phys Earths Interior 96 Jinzhai Rd Hefei 230026 Anhui Peoples R China;

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  • 正文语种 eng
  • 中图分类 地震学;
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