Surface Deformation and Source Modeling for the MW 7.3 Iran Earthquake (November 12, 2017) Exploiting Sentinel-1 and ALOS-2 Insar Data

摘要

In this study, an analysis of the November 12, 2017 northwestern Iran earthquake (Mw 7.3) is presented. A multi-frequency Synthetic Aperture Radar Interferometry (InSAR) approach was adopted to retrieve the ground deformation due to the mainshock. Then, InSAR results were used as input for the source modeling of the seismic event. C-Band Sentinel-l (IW TOPSAR acquisition mode) and L-Band ALOS-2 (Wide Swath) SAR data along both the ascending and descending orbits were processed. InSAR results show a displacement pattern in the epicentral area, with a maximum value up to ~1.0 meter. Preliminary analytical and numerical models suggest that the retrieved InSAR ground displacements are due to a slip dislocation (over 3.8 meters) on the causative fault and that dips to the east with a shallow angle of 16°.