We analyzed ascending and descending Sentinel-1 SAR imagery to map the coseismic displacement field resulting from the 24 September 2019 Mirpur earthquake in Pakistan. Though moderate in magnitude (Mw 5.8), this earthquake caused severe damage and significant devastation. InSAR-derived observations reveal that the seismic event occurred on a concealed southeast-striking fault. Peak line-of-sight (LOS) displacements, derived from the ascending and descending orbit datasets, were recorded at approximately 13 cm and 8.6 cm, respectively. The geodetic modeling indicates that the primary slip of 0.77 m occurred within the 6–10 km depth range on a fault plane characterized by a 274.37° strike and a 13.01° dip. The seismogenic fault dips to the southwest, which directly aligns with the geometry derived from our uniform slip model. Our InSAR-based inversion, utilizing a crustal rigidity of 30 GPa, estimates a seismic moment of 1.11 × 1018 N m (Mw 6.0). The results of the Coulomb stress change indicate that this seismic event promoted static Coulomb stress loading around the southern, eastern, and western margins of the rupture, which may signify an elevated seismic hazard for the surrounding regions.
Zhou et al. (Mon,) studied this question.