Combining Radar, Optical and GPS data for Vrancea seismic area analysis

Maria Zoran(1)

(1) National Institute of Optoelectronics, Atomistilor Street 1, Bucharest Magurele, MG5 , R 077125, Romania


As one of the most seismically active area in Europe, Vrancea region in Romania presents a relatively high potential of seismic hazard mainly due to the subcrustal earthquakes located at the sharp bend of the Southeast Carpathians. Is assumed to be placed at conjunction of four tectonic blocks which lie on the edge of the Eurasian plate. However, radar remote sensing can give also a valuable contribution for seismic area analysis, especially for its capability to make observations almost independently on the meteorological conditions and cloud coverage. Classifications of different geologic features and Digital Elevation Models (DEM) generation from SAR ERS1/2, Landsat TM , ETM , and ASTER data are highly correlated with in-situ ground data. In spite of providing the best constraints on the rate of strain accumulation on active faults (coseismic, postseismic, and interseismic deformation; plate motion and crustal deformation at plate boundaries), GPS measurements have a low spatial resolution, and deformation in the vertical direction can not be determined very accurately. GPS Romanian network stations data revealed a displacement of about 5 or 6 millimeters per year in horizontal direction relative motion, and a few millimeter per year in vertical direction. As Vrancea area is characterized by a significant regional tectonic activity, evidenced by neotectonic deformation and seismicity, future use of long-term InSAR data will be a useful tool in active tectonic investigation for this region.


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