SAR Interferometric Study of Deformation Processes in Kresna Fault

SAR interferometry based on ERS and ENVISAT data provides high resolution means for investigations of the surface deformation caused by seismic and tectonic activities. But to obtain stable and reliable results it is necessary to ensure coherence of measurements. In order to provide such conditions one should use natural object with approximately smooth topography so the multitemporal SAR observations could pertain coherence behavior in scale of several years, so invesigators being able to observe seismic cycle in its loading phase as long as possible. The aim of this proposal is to monitor deformation in Kresna (Bulgaria) area located in approximately flat valley, which has to be determined by at first by ERS data, not far from faults with high potential of great earthquakes. Another site under consideration is located at Bulgarian seashore (Golden Sands) and is chosen for monitoring the slow displacements of precipice above seashore line. For this case we plan to test the applicability of SAR interferometry approach to study seashore erosion processes and possible landslides. We plan first to implement a regional interferometric reference system with ENVISAT data for Kresna and Golden Sand; then to observe and interpret the deformation over periods 1 or 2 yr combining the ERS, in-situ GPS and tectonic data.