Kinematic Rupture Process and Its Implication of a Thrust and Strike-Slip Multi-Fault during the 2021 Haiti Earthquake

A devasting Mw7.2 earthquake struck southern Haiti on 14 August 2021, leading to over 2000 casualties and severe structural failures. This earthquake, which ruptured ~70 km west of the 2010 Mw7.0 event, offers a rare opportunity probe mechanical properties Haiti. study investigates kinematic multi-fault coseismic rupture process by jointly analyzing teleseismic interferometric synthetic aperture radar (InSAR) datasets. We determined optimal dip different segment faults through finite-fault inversion, results show that dips first, second third are 62°, 76° 76°, respectively, coinciding with relocated aftershock distribution. The estimated from our joint inversion revealed slip was dominated reverse motion in first strike-slip segments. Three patches were detected along strike, peak 3.0 m, reached surface at segment. shows unilateral high centroid velocity (5.5 km/s), broke stepover caused cascade rupture. front experiences directivity pulse ground motions amplitude short duration, may be an additional factor explaining many landslides concentrated western end fault. Coulomb failure stress change result indicates increases probability future events east 2021 main shock.