COSEISMIC DEFORMATION FIELD AND FAULT SLIP DISTRIBUTION OF THE 2015 CHILE Mw8.3 EARTHQUAKE

We obtain the coseismic surface deformation fields of the Chile Mw8.3 earthquake through analyzing Sentinel-1A/IW InSAR data from ascending and descending tracks. Based on an elastic dislocation model, we invert the coseismic fault slip.The depth where coseismic slip is near zero appears to a depth of 50 km, quantitatively indicating the down-dip limit of the seismogenic zone. At the same time, we find increased coseismic Coulomb stress change correlate well with the location of aftershocks.