Contemporaneous Thick- and Thin-Skinned Seismotectonics in the External Zagros: The Case of the 2021 Fin Doublet, Iran

In this work, we propose a geodetic model for the seismic sequence, with doublet earthquakes, that occurred in Bandar Abbas, Iran, November 2021. A dataset of Sentinel-1 images, processed using InSAR (Interferometric Synthetic Aperture Radar) technique, was employed to identify surface deformation caused by major events sequence and constrain their geometry kinematics seismological constraints. Coulomb stress transfer analysis also applied investigate sequence’s structural evolution space time. linear inversion data provided non-uniform distribution slip over fault planes. We performed an accurate relocation foreshocks aftershocks recorded locally established seismographs, thereby allowing us determine compressional tectonic regime affecting crustal volume. Despite very short time span our results clearly suggest distinct blind structures were previously unknown or only suspected causative faults. The first Mw 6.0 earthquake on NNE-dipping, intermediate-angle, reverse-oblique plane, while 6.4 almost horizontal low-angle (SSE-dipping) reverse segments top-to-the-south kinematics. former, which cut through displaced Pan-African pre-Palaeozoic basement, indicates thick-skinned style, latter rupture(s), within Palaeozoic–Cenozoic sedimentary succession likely exploited stratigraphic mechanical discontinuities, depicts thin-skinned style.