Multi-Scale Rupture Growth With Alternating Directions in a Complex Fault Network During the 2023 South-Eastern Turkiye and Syria Earthquake Doublet

A devastating doublet of earthquakes with moment magnitude M-W 7.9 and M-W 7.6 earthquakes contiguously occurred in SE Turkiye near the NW border of Syria. Here we perform a potency-density tensor inversion to simultaneously estimate rupture evolution and fault geometry for the doublet. We find the initial M-W 7.9 earthquake involved discrete episodes of supershear rupture and back-rupture propagation, and was triggered by initial rupture along a bifurcated splay of the East Anatolian Fault. The second M-W 7.6 event was triggered by the earlier M-W 7.9 event, and it involved more extensive supershear rupture along a favorably curved fault, and was likely stopped by geometric barriers at the fault ends. Our results highlight the multi-scale cascading rupture growth across the complex fault network that affects the diverse rupture geometries of the 2023 Turkiye earthquake doublet, contributing to the strong ground shaking and associated devastation.