GROUND DEFORMATION MAPPING USING INSAR

摘要

SAR interferometric data can be used for extracting three dimensional information of the earth's surface by using the phase part of the radar signal. In this study, available SAR interferometric data acquired before and after the Marmara earthquake of 1999 and provided by ESA were used for mapping the ground deformation in the satellite line of sight (LOS) in the Izmit province. The interferometric suitability of the available SAR data was tested by computing the base length. In order to construct the interferogram, ERS-2 satellite data having the orbit numbers of 22556 and 23057 were processed using ROI-PAC software, the InSAR software package developed at the Jet Propulsion Laboratory, California, USA. Instead of phase unwrapping technique, all fringes were digitized manually from the interferogram to compute relative LOS ground deformations. Thanks to continuous DGPS stations located both at the Northern and Southern parts of the NAF (North Anatolian Fault), absolute LOS ground deformations were mapped. The DGPS stations used for computing absolute ground deformation are still operated by TUBITAK-Marmara Research Center (MRC), Earth and Marine Sciences Research Institute (EMSRI).