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Co-seismic Deformation Field and Fault Slip Distribution of the 2021 Maduo Mw 7.4 Earthquake in Qinghai, China Based on InSAR Technology(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2022年第06期
Page:
1016-1026
Research Field:
纪念刘国昌先生诞辰110周年专辑
Publishing date:

Info

Title:
Co-seismic Deformation Field and Fault Slip Distribution of the 2021 Maduo Mw 7.4 Earthquake in Qinghai, China Based on InSAR Technology
Author(s):
WANG Shou-wen1;  JI Ling-yun1; 2*;  ZHU Liang-yu2;  LIU Chuan-jin2
(1. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China; 2. The Second Monitoring and Application Center of China Earthquake Administration, Xi'an 710054, Shaanxi, China)
Keywords:
Maduo Mw 7.4 earthquake;  geodesy;  InSAR;  co-seismic deformation;  fault slip;  earthquake source parameter;  joint inversion
PACS:
P315; P23
DOI:
10.19814/j.jese.2022.04017
Abstract:
On May 22, 2021, the Mw 7.4 earthquake occurred in Maduo county of Qinghai province. In order to study the co-seismic deformation, slip distribution, static Coulomb stress changes and effects of Maduo Mw 7.4 earthquake, the image data of sentinel-1 A/B satellite's ascending and descending SAR were selected, and D-InSAR technology was used to obtain the co-seismic deformation field of Maduo Mw 7.4 earthquake. Based on the steepest decent method(SDM), combined with GPS and InSAR co-seismic deformation data, the inversion of the co-seismic sliding distribution was constrained jointly. The results show that the co-seismic deformation field caused by Maduo Mw 7.4 earthquake has a very wide range of effects, resulting in surface ruptures of 170 km in length; earthquakes cause the maximum 1.2 m of the LOS on the surface and the maximum relative displacement of 2.2 m for uplift and sedimentation; the overall average direction of Maduo Mw 7.4 earthquake fault is 283°, the average sliding angle is 21°, and the inclination angle is 77°; fault slip is dominated by left-handed slippage, mainly concentrated within 12 km underground; the maximum sliding amount of joint GPS and InSAR co-seismic data inversion is 3.60 m; the inverted magnitude is approximately Mw 7.42; the causative fault ruptures the surface. Combined with the static Coulomb stress results caused by the same earthquake and the spatial distribution characteristics of the aftershocks around the earthquake, the results show that most of the aftershocks occur near faults, with a small number of aftershocks occurring in the east and west Coulomb stress-increasing zone. There is a certain amount of Coulomb stress accumulation on the east and west sides of the seismic fault, and there may be a high seismic risk.

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Last Update: 2022-11-25