American Geophysical Union, California, Amerika Birleşik Devletleri, 9 - 13 Aralık 2019, ss.1
Here we will be presenting an up-to-date analysis of the postseismic deformation by complementing the data from eight near-field GPS campaigns with up to 5 years of InSAR measurements from the Sentinel-1 satellites between 2014 and 2019. Persistent scatterer InSAR method is used to calculate the surface deformation maps from both the descending and ascending orbits to reveal the extent and the nature of the postseismic movement. The geodetic data clearly indicate that the postseismic ground motion following the earthquake has not ceased yet, making it one of the longest lasting postseismic deformation following a thrust faulting event in the world.
One of the key features observed in the velocity maps is the presence of shallow afterslip along a NE-SW extending sharp discontinuity that is different than the up-dip trace of the causative coseismic fault that lies between Lake Van to the west and Lake Erçek to the east. While the westernmost part of the discontinuity coincides with the earlier recognized aseismic slip on the Bostaniçi (Beyüzümü) Fault to the south that crosses the Van city center, the remaining part of the discontinuity veers towards northeast and reaches the Kozluca Fault on the western coast of Lake Erçek, confirming our earlier coseismic study where that fault was proposed as being part of the main coseismic rupture bounding it to the east.