Coseismic deformation and slip distribution of the 2024 Ms 7.1 Wushi earthquake based on InSAR observations
An Ms 7.1 earthquake occurred in Wushi County in the Xinjiang Uygur Autonomous Region of China on January 23,2024.The rapid and accurate identification of its coseismic deformation field and the sliding characteristics of the originating faults can helpto scientifically understand the mechanism of origination of this earthquake.In this study,we obtain the coseismic deformation field of the earthquake by using radar images from the Sentinel-1 satellite in ascending and descending orbits as well as the differential interferometric synthetic aperture radar(D-InSAR).We then identify the parameters of the seismic source of the earthquake based on the Okada elastic dislocation model,and invert the slip distribution on the fault plane of the earthquake by using a model of slip distribution.The results showed that the maximum deformations of the coseismic deformation fields along the line of sight from the ascending and descending orbits were 75 cm and 48 cm,respectively,while the maximum slip on the faults was 4.2 m.The latter was mainly concentrated in the region 3~20 km below the surface of the ground.The results of model normalization showed that the maximum uplift of the earthquake was 53 cm in the vertical direction,while the maximum subsidence was 12 cm.The motion of seismic faults was mainly retrograde,with a small number of left-rotation strike-slip deformations.We used the results of InSAR and geological data to conclude that the Maidan Fault was the main fault of the earthquake.
Wushi earthquakedifferential interferometric synthetic aperture radarcoseismic deformationslip distribution