Surface Deformation of The 2019 Mirpur Earthquake Estimated from Sentinel-1 Insar Data
Divya Sekhar Vaka, Y. S. Rao, Tejpal Singh
Abstract
The coseismic surface displacement of the 2019 M <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">w</sub> 5.4 Mirpur earthquake is derived using Differential Synthetic Aperture Radar Interferometry (DInSAR) technique. Two Sentinel-1 radar images before and after the earthquake acquired in interferometric wide swath mode are used for displacement map generation. Two definite lobes of deformation corresponding to subsidence and uplift are observed from the displacement map. The results indicate an uplift of 9.5 cm and subsidence of -6.2 cm in the earthquake epicentral region. Using a forward elastic dislocation model the causative source parameters of the earthquake are randomly searched using an iterative approach, which minimizes the error between the InSAR data and the modeled results. The inversion results indicate a rectangular fault of length ~10 km and width ~5 km is responsible for the earthquake. Other source parameters such as strike, dip, depth, and the slip of the earthquake are also calculated during the coseismic inversion.