SOURCE MODEL OF THE 12 NOVEMBER 2017 M_W 7.3 KERMANSHAH EARTHQUAKE (IRAN-IRAQ BORDER) INFERRED FROM ALOS-2 SCANSAR AND SENTINEL-1 DATA

摘要

In this paper, ground deformation and source model of the 12 November 2017 Kermanshah Earthquake (border region between Iran and Iraq) are investigated by using ALOS-2 ScanSAR and Sentinel-1A/B TOPSAR co-seismic Differential Interferometric Synthetic Aperture Radar (DInSAR) measurements. Geodetic inversion has been performed to constrain source parameters and invert slip distribution on the fault plane. Stress changes on the source fault and neighboring active faults around this area are estimated based on co-seismic deformation. The best-fit source model shows a reverse fault with a relative large right-lateral component, striking 353.5° NNW-SSE and dipping 16.3° NE. The maximum slip is up to 3.8m at 12-14km depth and the inferred seismic moment is 1.01×10~(20) Nm, corresponding to M_W 7.3. The positive stress changes on the neighboring active faults indicate that this event may trigger other earthquakes on the Zagros Mountain Front Fault (MFF).