基于Sentinel-1A数据的四川长宁MS6.0地震同震形变场分析及断层滑动分布反演

doi:10.12196/j.issn.1000-3274.2020.03.002

Abstract

Abstract: This paper uses geodesy method to study the coseismic deformation field characteristics and seismogenic fault parameters of the M_S6.0 earthquake in Changning, Sichuan on June 17, 2019. The ascending and descending Sentinel-1A data are processed to obtain the interferograms based on DInSAR technology, and to achieve coseismic deformation field correction by considering atmospheric refraction effect and deformation error caused by aftershocks. Based on the deformation data after quadtree sampling, the elastic half-space layered model is used to iteratively invert the slip distribution of the fault geometry.The results show a left-lateral strike-slip movement of seismogenic fault,the moment magnitude is M_W5.9, the fault rupture scale is 28 km×20 km, and the focal depth is about 9.4 km. The ascending and descending coseismic deformation fields indicate different deformation characteristics on the two sides of the fault, the maximum settlements are 8.34 cm (ascending) and 4.23 cm (descending), and the maximum uplifts are 5.5 cm (ascending) and 7.5 cm (descending) respectively. The strike of the seismogenic fault is 302°, the dip angle is 43°, the average slip angle is 50°, and the maximum slip of the fault plane is 0.28 m.

Key words: Changning M_S6.0 earthquake, Sentinel-1A, DInSAR, Coseismic deformation field, Slip distribution

CLC Number:

P315.7

SUN Kai, MENG Guo-jie, HONG Shun-ying, HUANG Xing, DONG Yan-fang. Coseismic Deformation and Fault Slip Inversion of the M_S6.0 Earthquake Changning, Sichuan Based on Sentinel-1A Data[J]. EARTHQUAKE, 2020, 40(3): 15-27.

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Coseismic Deformation and Fault Slip Inversion of the M_S6.0 Earthquake Changning, Sichuan Based on Sentinel-1A Data

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Coseismic Deformation and Fault Slip Inversion of the MS6.0 Earthquake Changning, Sichuan Based on Sentinel-1A Data

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Coseismic Deformation and Fault Slip Inversion of the M_S6.0 Earthquake Changning, Sichuan Based on Sentinel-1A Data