El Mayor Cucapah earthquake: Postseismic Deformation from InSAR and GPS observations

El Mayor Cucapah earthquake ocurred on April 4, 2010, rupturing several previously mapped as well as unidentified faults, including the Pescadores, Borrego and Paso Superior faults in Cucapah Mountains, and Indiviso fault in the Mexicali valley. We conducted several campaign GPS surveys of pre-existing and newly established benchmarks within 30 km of the earthquake rupture. Most of the benchmarks were occupied within days after the earthquake, allowing us to capture the entire postseismic transient.GPS timeseries indicate a gradual decay in postseismic velocities having the same sense as the coseismic displacements. We also analyzed available Synthetic Aperture Radar (SAR) data from ENVISAT and ALOS satellites. The main deformation features seen in the line of sight displacement maps indicate subsidence in the southern and northern part of the Indiviso and Paso Superior faults, respectively. We investigate to which extent GPS and InSAR observations can be explained by commonly assumed mechanisms of postsesimic deformation. In particular, we present a best-fitting afterslip model for the time period of 6 months after the earthquake.