SAR-BASED INDICES ANALYSIS FOR DAMAGE ASSESSMENT DUE TO EARTHQUAKE

The purpose of this study is to assess the capability of SAR remote sensing data and its relevant techniques for damage detection in urban areas and monitor the deformation due to the earthquake. The case study of this research is the 2005 Qeshm earthquake. The data used are pre-seismic and co-seismic pairs of Envisat RADAR images in ascending and descending orbits. In this study pre and co-seismic coherence, intensity and correlation coefficient of intensity maps were calculated from the related interferograms and SAR SLC images. In order to represent the damage categories, a number of indices were necessary to be defined based on the pre and co-seismic coherence and correlation maps. The indices were calculated as differences between the pairs. The analysis of the maps showed that the increase in damaged areas resulted in decrease of their corresponding coherence values as opposed to the intensity values which increased when the damage increased.

کلیدواژه ها:

Coherence ، Intensity Correlation ، Interferogram ، Earthquake damage assessment