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首页> 外文期刊>Seismological research letters >Sensitivities of Geodetic Source Analyses to Elastic Crust Heterogeneity Constrained by Seismic Tomography for the 2017 M-w 6.5 Jiuzhaigou, China, Earthquake
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Sensitivities of Geodetic Source Analyses to Elastic Crust Heterogeneity Constrained by Seismic Tomography for the 2017 M-w 6.5 Jiuzhaigou, China, Earthquake

机译：地理源分析对2017 M-W 6.5九寨沟的地震断层扫描的弹性地壳异质性的敏感性。

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摘要

The 2017 M-w 6.5 Jiuzhaigou earthquake (JE) struck a rugged area of the Jiuzhaigou Valley in eastern Tibet that has experienced frequent seismic activity over the last few decades. We use finite-element models (FEMs) and Sentinel-1 Interferometric Synthetic Aperture Radar observations to characterize the earthquake source. The FEM domain accommodates a heterogeneous (HET) distribution of realistic crustal materials inferred by regional seismic tomography data. The HET-derived source configurations yield a significantly smaller misfit, at the 95% confidence level, than that estimated for a homogeneous (HOM) half-space. The former generally requires a lower degree of smoothing constraint, highlighting that the HET solutions are systematically more compatible with the surface observations than the HOM solutions. The magnitudes of induced Coulomb failure stress change (Delta CFS) estimated by the HET solution drastically differ (by >0.1 MPa) from those calculated by the HOM solution. The post-earthquake stability of near-field faults is generally overestimated by the HOM estimations, whereas some localities of negative Delta CFS(HOM )are predicted with positive Delta CFSHET. These results highlight the sensitivities of both slip and stress estimations to the complexity of the adopted elastic modeling domain, leading to more accurate aftershock hazard assessments. The HET-resolved seismic rupture reveals two major slip asperities of magnitude up to 0.83 m distributed along the fault strike, which is coherent with the aftershock distribution. Two aftershock clusters are consistently found near or below these two peak-slip zones, which are imaged by the HET model but absent in the HOM solution. The JE hypocenter and aftershocks are bounded below by a negative velocity anomaly (Delta V-P, Delta V-S down to -4%) at similar to 18 km depth. Such low-velocity layers of reduced strength may be relevant to the vertical distribution of seismicity and earthquake slip, which provide
机译：2017年M-W 6.5九寨沟地震（JE）在西藏九寨沟谷的崎岖地区袭击了在过去几十年中经历过频繁的地震活动。我们使用有限元模型（FEMS）和Sentinel-1干涉合成孔径雷达观测，以表征地震源。由区域地震断层扫描数据推断，FEM结构域可容纳现实地壳材料的异质（HET）分布。 HET衍生的源配置产生了比95％的置信水平在95％的置信水平上产生明显较小的错位。前者通常需要较低程度的平滑约束，突出显示HET溶液与表面观察系统更兼容而不是HOM解决方案。由HET溶液估计的诱导的库仑衰竭应力变化（Delta CFS）的大小来自由HOM溶液计算的那些差异（按> 0.1MPa）。近场故障的后地震稳定性通常由HOM估计过度估计，而用正ΔCFShet预测阴性Delta CFS（HOM）的一些地方。这些结果突出了滑动和应力估计对采用弹性建模领域的复杂性的敏感性，从而导致更准确的余震危险评估。 HET分辨的地震破裂揭示了两种主要滑动粗糙度，沿着故障撞击分布的0.83米，这与余震分布相干。这两个峰值滑动区附近或下方持续发现两个余震簇，其由HET模型成像，但在HOM解决方案中不存在。 JE Hypocenter和余震在下面的负速度异常（Delta V-P，Delta V-S下降至-4％）界定，类似于18km深度。这种低速度的低速层可能与地震性和地震滑动的垂直分布有关，提供

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  • 来源
    《Seismological research letters》 |2019年第5期|共17页
  • 作者

    Tung Sui; Katzenstein Kurt; Masterlark Timothy; Lei Jianshe; Wauthier Christelle; Petley Dave;

  • 作者单位

    South Dakota Sch Mines &

    Technol Dept Geol &

    Geol Engn 501 E St Joseph St Rapid City SD 57701 USA;

    South Dakota Sch Mines &

    Technol Dept Geol &

    Geol Engn 501 E St Joseph St Rapid City SD 57701 USA;

    South Dakota Sch Mines &

    Technol Dept Geol &

    Geol Engn 501 E St Joseph St Rapid City SD 57701 USA;

    China Earthquake Adm Key Lab Crustal Dynam Inst Crustal Dynam 1 Anningzhuang Rd Beijing 100085 Peoples R China;

    Penn State Univ Dept Geosci 311 Deike Bldg State Coll PA 16801 USA;

    Univ Sheffield Dept Geog Western Bank Sheffield S10 2TN S Yorkshire England;

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  • 正文语种 eng
  • 中图分类 地震学;
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