Surface Rupture Kinematics and Coseismic Slip Distribution during the 2019 Mw7.1 Ridgecrest, California Earthquake Sequence Revealed by SAR and Optical Images
Surface Rupture Kinematics and Coseismic Slip Distribution during the 2019 Mw7.1 Ridgecrest, California Earthquake Sequence Revealed by SAR and Optical Images
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SAR 和光学图像揭示的 2019 年 Mw7.1 加利福尼亚州里奇克莱斯特地震序列期间的表面破裂运动学和同震滑移分布
DOI：
10.3390/rs12233883
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发表时间：
2020-11
期刊：
影响因子：
5
通讯作者：
Nie jing
中科院分区：
文献类型：
--
作者：
Li Chenglong;Zhang Guohong;Shan Xinjian;Zhao Dezheng;Li Yanchuan;Huang Zicheng;Jia Rui;Li Jin;Nie jing
2019年里奇克雷斯特，加州地震序列沿着沿着一个复杂的断层系统破裂，并引发了交叉断层上的地震和地震滑动。为了表征地表破裂运动学和断层滑动分布，我们使用光学图像和干涉合成孔径雷达（干涉合成孔径雷达）观测来重建地震序列引起的位移。我们进一步计算了南北和东西分量的旋度和散度，以有效地识别地表破裂痕迹。结果表明，主发震断层长约55 km，走向320°，由5条次级断层组成。在确定的多断层几何形状的基础上，我们通过干涉合成孔径雷达测量反演了同震滑动分布，这表明Mw7.1主震以右旋走滑为主（最大走滑约5.8 m，深度约7.5 km），在东倾断层上有一个小的倾滑分量（峰值约1.8 m）。Mw6.4前震以北倾断层上的左旋走滑为主。这些地震触发了沿Garlock断层（117.3° W-117.5° W）的明显的地震蠕动（沿着）。这些结果与该地震序列的破裂过程相一致，其特征是复杂的级联破裂，而不是单一的连续破裂前缘沿沿着多条断层传播。
The 2019 Ridgecrest, California earthquake sequence ruptured along a complex fault system and triggered seismic and aseismic slips on intersecting faults. To characterize the surface rupture kinematics and fault slip distribution, we used optical images and Interferometric Synthetic Aperture Radar (InSAR) observations to reconstruct the displacement caused by the earthquake sequence. We further calculated curl and divergence from the north-south and east-west components, to effectively identify the surface rupture traces. The results show that the major seismogenic fault had a length of ~55 km and strike of 320° and consisted of five secondary faults. On the basis of the determined multiple-fault geometries, we inverted the coseismic slip distributions by InSAR measurements, which indicates that the Mw7.1 mainshock was dominated by the right-lateral strike-slip (maximum strike-slip of ~5.8 m at the depth of ~7.5 km), with a small dip-slip component (peaking at ~1.8 m) on an east-dipping fault. The Mw6.4 foreshock was dominated by the left-lateral strike-slip on a north-dipping fault. These earthquakes triggered obvious aseismic creep along the Garlock fault (117.3° W–117.5° W). These results are consistent with the rupture process of the earthquake sequence, which featured a complicated cascading rupture rather than a single continuous rupture front propagating along multiple faults.
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影响因子：
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