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首页> 外文期刊>Seismological research letters >Coseismic Slip Model of the 2018 M-w 7.9 Gulf of Alaska Earthquake and Its Seismic Hazard Implications
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Coseismic Slip Model of the 2018 M-w 7.9 Gulf of Alaska Earthquake and Its Seismic Hazard Implications

机译：2018 M-W 7.9墨西哥阿拉斯加地震海湾的电影滑动模型及其地震危害影响

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摘要

On 23 January 2018, the M-w 7.9 Gulf of Alaska earthquake occurred near the Aleutian subduction zone, where the devastating M-w 9.2 megathrust earthquake occurred in 1964. Such a large event can redistribute stress on nearby fault planes, which promotes failure and can perhaps trigger aseismic events. In this study, we use onshore Global Positioning System (GPS) data to retrieve coseismic ground deformation and to invert for the finite-fault-slip distribution on complex fault geometries. Complex fault geometries are initially determined by applying constraints such as the aftershock distribution and backprojection imaging, followed by fitting the GPS observations. We model the Gulf of Alaska earthquake as a rupture on an orthogonal conjugate fault system that contains four sub-faults. We find that 71.6% of the total moment release occurred on two west-southwest-oriented fault planes. The Coulomb failure stress increased by up to 1.01 +/- 0.39 bar in the shallow portion of the eastern Aleutian subduction zone between 149 degrees and 151 degrees W. Mapping of stress changes from the 2018 Gulf of Alaska earthquake indicates a limited stress increase in the region of the 1964 Alaska earthquake.
机译：2018年1月23日，阿拉斯加地震MW 7.9湾发生了阿雷迪亚郊区发生的地震，其中摧毁了MW 9.2巨大的地震发生在1964年。这样的大型活动可以在附近的故障飞机上重新分配压力，这促进了失败，也许可能引发爆发事件。在这项研究中，我们使用陆上全球定位系统（GPS）数据来检索电影造型地变形并反转复杂断层几何形状上的有限情况滑动分布。最初通过应用诸如余震分布和反扩展成像的约束来确定复杂的故障几何形状，然后拟合GPS观察。我们将Alaska地震的鸿沟模拟了包含四个子故障的正交共轭故障系统的破裂。我们发现，总时刻释放的71.6％发生在两个西南至关上的故障飞机上。在149度和151摄氏度之间的东部阿列丁郊区浅部分中，库仑衰竭应力增加到1.01 +/- 0.39巴。从阿拉斯加地震的2018年海湾的压力变化的映射表明了有限的压力增加了1964年阿拉斯加地震的地区。

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  • 来源
    《Seismological research letters》 |2019年第2appa期|共7页
  • 作者

    Zhao Bin; Qi Yujie; Wang Dongzhen; Yu Jiansheng; Li Qi; Zhang Caihong;

  • 作者单位

    China Earthquake Adm Inst Seismol Key Lab Earthquake Geodesy 40 Hongshancelu Rd Wuhan 430071 Hubei Peoples R China;

    China Earthquake Adm Inst Seismol Key Lab Earthquake Geodesy 40 Hongshancelu Rd Wuhan 430071 Hubei Peoples R China;

    China Earthquake Adm Inst Seismol Key Lab Earthquake Geodesy 40 Hongshancelu Rd Wuhan 430071 Hubei Peoples R China;

    China Earthquake Adm Inst Seismol Key Lab Earthquake Geodesy 40 Hongshancelu Rd Wuhan 430071 Hubei Peoples R China;

    China Earthquake Adm Inst Seismol Key Lab Earthquake Geodesy 40 Hongshancelu Rd Wuhan 430071 Hubei Peoples R China;

    China Earthquake Adm Inst Seismol Key Lab Earthquake Geodesy 40 Hongshancelu Rd Wuhan 430071 Hubei Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地震学;
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