Search

Two major earthquakes of Mw7.8 and Mw7.5 ruptured the Southern East Anatolian Fault (SEAF) and the Savrun‐Çardak‐Sürgü fault (SCSF), devastating southeast Türkiye and northwest Syria on 6 February 2023. We adopt innovative nonlinear and linear approaches to analyze the coseismic ground displacements and estimate the complex slip geometry. Unlike conventional analytical solutions that simplify crust heterogeneity, finite‐element fault models invert the displacement data and simulate the dual‐fault geometry with non‐uniformly distributed shallow crustal materials. Our results suggest the west‐dipping SEAF and north‐dipping SCSF accommodate earthquake slips of >10 m. Their respective slip distributions and proximal aftershocks correlate spatially with local seismic velocity anomalies (i.e., ΔVp and ΔVs), which implies differences in structural control along these two faults and provides insights into assessing the seismic hazard of mixed incipient‐mature fault systems. Plain Language Summary: In early February of 2023, southeast Türkiye and northwest Syria experienced two devastating earthquakes that claimed more than 50,000 lives and caused substantial economic loss. The epicenters are located near the active tectonic boundary between the Anatolian and Arabian Plate. The complex seismic rupture occurred over two faults, the Southern East Anatolian Fault (SEAF) and the Savrun‐Çardak‐Sürgü Fault (SCSF). Satellite interferometric images and global positioning networks capture large‐scale ground movements. Our study adopts a novel approach to analyze the slip pattern and explore the fault orientation and slip distribution. The result highlights that the fault rupture, aftershock, and local velocity anomalies are correlated, but the correlation pattern differs between the SEAF and SCSF. This improves our understanding of the earthquake hazard along the plate boundaries that host faults of different maturity levels. Key Points: Coseismic slip distribution of the 2023 Kahramanmaraş Earthquake is estimated from the ground displacements observed by SAR and global navigation satellite system dataInnovative nonlinear‐crossover‐linear inversion method combined with finite element elastic models simulating rock heterogeneityEarthquake slips and aftershocks correlating spatially with velocity anomalies imply structural controls and different fault maturity [ABSTRACT FROM AUTHOR]