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InSAR Monitoring and Inversion of 2021 Yangbi Mw 6.4 Earthquake in Yunnan, China(PDF)

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

Issue:
2022年第03期
Page:
558-567
Research Field:
大地测量、遥感与地学大数据
Publishing date:

Info

Title:
InSAR Monitoring and Inversion of 2021 Yangbi Mw 6.4 Earthquake in Yunnan, China
Author(s):
WEI Yun-jie1;  WANG Ting2;  YANG Cheng-sheng2*;  LYU Sen2
(1. China Institute of Geo-environment Monitoring, Beijing 100081, China; 2. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China)
Keywords:
geodesy;  earthquake;  earthquake source parament;  co-seismic deformation field;  InSAR;  fault parameter;  Coulomb stress;  Yangbi earthquake
PACS:
P315; P22
DOI:
10.19814/j.jese.2021.07009
Abstract:
On May 21, 2021, Yangbi Mw 6.4 earthquake occurred in Dali area of Yunnan, China. However, the pre-research on the geological structure in the seismogenic area of this earthquake is weak. It is scientific significance for the in-depth understanding of the seismogenic, seismogenic mechanism and characteristics of tectonic activity in Yangbi area and its adjacent areas to monitoring and inversing source parameter for this earthquake. The Sentinel-1A SAR satellite images of ESA were used to obtain the co-seismic deformation field of the earthquake from different orbits, and the Okada rectangle elastic dislocation model was used to invert the earthquake source parameters and the co-seismic slip distribution. The results show that the maximum uplift and maximum subsidence deformation caused by co-seismic rupture are both over 10 cm. The inversion results of the co-seismic show that the earthquake is caused by the rupture of a fault with a length of 12.2 km, a width of 5.0 km, a strike of 132° and a dip angle of 83°; the earthquake is a significant right-lateral strike-slip movement. The average slip is 0.19 m and the average slip angle is -153.6°, and the magnitude is Mw 6.1, which is consistent with the focal mechanism solution published by USGS and GCMT. At the same time, Coulomb stress of co-seismic is 4.21×1025 dyne·cm-1, which is equivalent to Mw 6.38; and Coulomb stress distribution reflects that the earthquake is dominated by stress release, which further triggers strike-slip earthquake unlikely.

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Last Update: 2022-06-01