Physics
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.550e..67e&link_type=abstract
Proceedings of the FRINGE 2003 Workshop (ESA SP-550). 1-5 December 2003, ESA/ESRIN, Frascati, Italy. Editor: H. Lacoste. Publish
Physics
Scientific paper
On September 7, 1999 a magnitude MW=5.9 earthquake occurred in the Athens area (Greece) producing a subsidence of about 6 cm detected by radar interferometry. Using seventeen ERS SAR images acquired between December 1997 and January 2001, one hundred thirty six interferograms of the area have been calculated using the CNES DIAPASON software. Among them, eighty-one have been selected on the basis of coherence and used in the processing. These interferograms have been used to produce a collective coherence map and they have been unwrapped using the SNAPHU software. Orbital effects have been reduced by tilting and shifting the unwrapped interferograms, making the assumption that no deformation has occurred in zones located at the edges of the scene, which are far away from the area affected by the earthquake. This procedure was applied constraining the deformation value of the most coherent pixels in the selected zones to a zeroed value. Twenty-four co-seismic, five pre-seismic and eight post-seismic interferograms have been finally selected on the basis of the coherence of the phase signal. The co-seismic interferograms have been stacked to produce a smoothed image of the average deformation field. The resulted deformation field is used to recalculate the deformation source and to produce a new model, which is found to be close to that proposed by Kontoes et al., 2000. The synthetic interferogram issued from the model is then subtracted from each co-seismic interferogram. The corrected residuals of the co-seismic interferograms and the corrected pre- and post- seismic interferograms are finally examined to detect any temporal evolution of the deformation before and after the main event.
Avallone Anna
Briole Pierre
Elias Peter
Kontoes C.
Paradissis D.
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