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Authors: Chini, M.* 
Bignami, C.* 
Stramondo, S.* 
Title: Comment on “Surface deformation caused by April 6th 2009 earthquake in L’Aquila (Italy): A comparative analysis from ENVISAT ASAR, ALOS PALSAR and ASTER” by M.A. Goudarzi, T. Woldai, V.A. Tolpekin
Issue Date: 2012
Series/Report no.: /18 (2012)
DOI: 10.1016/j.jag.2011.12.009
Keywords: SAR interferometry
surface deformation
Subject Classification04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations 
04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy 
Abstract: The present work concerns some observations about the paper by Goudarzi et al. (2011), related to the surface deformation analysis carried out for the earthquake that hit the city of L’Aquila, Italy, on April 2009 and based on SAR Differential Interferometry (DInSAR) technique. We have manly identified a criticality about the post-seismic deformation, named by the author postseismic relaxation. The analysis performed by Goudarzi et al. (2011) leads to misleading conclusions in terms of seismic hazard all over the epicentral region. Here, some considerations driven by literature and interferograms comparison demonstrate the incorrectness of their interpretation concerning the coseismic and post seismic surface deformation.
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