Estimation of Three-Dimensional Coseismic Deformation and Inversion of Fault Slip Distribution for the Menyuan, Qinghai MW6.6 Earthquake in 2022 Using InSAR
Abstract:We use remote sensing data from the C-band Sentinel-1 and L-band ALOS-2 satellites, which cover the Menyuan area, and apply differential interferometry(D-InSAR), pixel offset tracking(POT), and multi-aperture InSAR(MAI) techniques to obtain the coseismic surface deformation fields of the 2022 Menyuan, Qinghai MW6.6 earthquake in line-of-sight and azimuth directions. By combining the surface stress-strain model with the variance component estimation(SM-VCE) method, we deduce the three-dimensional coseismic displacement. Furthermore, we use both nonlinear and linear approaches to invert the geometric parameters, such as dip angle and strike, as well as the distribution characteristics of coseismic slip. The results reveal that the earthquake was a left-lateral strike-slip event, with the fault extending northwest-southeast from the epicenter. The maximum horizontal displacement reached 1.58 m, and the predominant sliding occurred within a depth range of 0 to 8 km underground, with a maximum slip of 3.54 m. Based on the inversion results, the moment magnitude of earthquake is estimated to be MW6.67.
ZHOU Tian,ZHU Wu,LIU Xiaoyu et al. Estimation of Three-Dimensional Coseismic Deformation and Inversion of Fault Slip Distribution for the Menyuan, Qinghai MW6.6 Earthquake in 2022 Using InSAR[J]. jgg, 2024, 44(7): 725-731.