Coseismic and Early Postseismic Deformation Due to the 2021 M7.4 Maduo (China) Earthquake
Coseismic and Early Postseismic Deformation Due to the 2021 M7.4 Maduo (China) Earthquake
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DOI：
10.1029/2021gl095213
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发表时间：
2021-11-16
影响因子：
5.2
通讯作者：
Fialko, Yuri
中科院分区：
文献类型：
--
作者：
Jin, Zeyu;Fialko, Yuri
2021年玛多地震使西藏东北部一条150公里长的左旋断层破裂。我们使用Sentinel-1A/B卫星在地震发生后几天内收集的合成孔径雷达数据，推导出有限断层模型，并研究了滑动分布随深度的细节。我们从对应于上升和下降卫星轨道的不同观测方向生成同震干涉图和像素偏移。在东端断裂分叉成两个平行的股，与较大的滑动在北方股。同震位移的反演显示，最大滑动震中以东。同震滑动平均值在3- 4km深度处有一个峰值，与许多浅源走滑地震的滑动分布相似。玛多地震后几周的震后观测显示，地表滑动幅度高达0.1米，至少部分消除了最上层地壳的同震滑动赤字。
The 2021 Maduo earthquake ruptured a 150 km-long left-lateral fault in the northeast Tibet. We used Synthetic Aperture Radar data collected by the Sentinel-1A/B satellites within days of the earthquake to derive a finite fault model and investigate the details of slip distribution with depth. We generated coseismic interferograms and pixel offsets from different look directions corresponding to the ascending and descending satellite orbits. At the eastern end the rupture bifurcated into two sub-parallel strands, with larger slip on the northern strand. Inversions of coseismic displacements show maximum slip to the east of the epicenter. The averaged coseismic slip has a peak at depth of 3-4 km, similar to slip distributions of a number of shallow strike-slip earthquakes. Postseismic observations over several weeks following the Maduo earthquake reveal surface slip with amplitude up to 0.1 m that at least partially eliminated the coseismic slip deficit in the uppermost crust.