PSI Techniques Applied to Mapping Surface Displacements in Active Tectonics Areas: TERRAFIRMA Tectonic Theme
Stramondo, Salvatore¹; Cyziene, Jolanta²; Ganas, Athanassios³; Guerra, Ignazio⁴; Lagios, Evangelios⁵; Parcharidis, Issaak⁶; Zulfikar, Can⁷; Adam, Nico⁸; Bignami, Christian¹; Erdik, Mustafa⁷; Mine, Demircioglu⁷; Foumelis, Michael⁶; Gervasi, Anna⁴; Manunta, Michele⁹; Novali, Fabrizio¹⁰; Sakkas, Vassilios⁵; Sansosti, Eugenio⁹; Serpelloni, Enrico¹; Solaro, Giuseppe⁹; Stamatopoulos, Kostantinos¹¹; Ventura, Guido¹; Zucca, Francesco¹²; Chini, Marco¹³; Satkunas, Jonas^2
1Istituto Nazionale di Geofisica e Vulcanologia, ITALY; ²LGS, LITHUANIA; ³NOA, GREECE; ⁴University of Calabria, ITALY; ⁵University of Athens, GREECE; ⁶Harokopio University of Athens, GREECE; ⁷KOERI, TURKEY; ⁸DLR, GERMANY; ⁹CNR-IREA, ITALY; ¹⁰Telerilevamento Europa, ITALY; ¹¹Stamatopoulos & Associates Co., GREECE; ¹²University of Pavia, ITALY; ¹³CRP Gabriel Lippmann, LUXEMBOURG

Active tectonics represents the fieldwork where SAR Interferometry (InSAR) obtained the larger number of results. Since early '90 the capabilities of InSAR technique have been exploited to study the surface displacement related to moderate-to-strong earthquakes. Although standard InSAR has been demonstrated to be an effective tool for coseismic deformation retrieval, the step forward towards the detection of interseismic movements (e.g. creep) required significant improvements. The PSI (Persistent Scatterers Interferometry) approach has demonstrated its capability to detect mm/year movements over large areas. The very high accuracy of such multitemporal InSAR techniques can be exploited to generate reliable products and services to be integrated in the monitoring chain of end users and decision makers. The Extension Phase of ESA Terrafirma (TFX) Project has been focused on thematic topics, in particular Flooding, Hydrogeology and Tectonics. The Tectonic Theme of TFX Project is aimed at exploiting PSI from ERS, Envisat and, for testing issues, TerraSAR-X data, for providing velocity maps of some of the most seismically active regions in Europe including Italy, Turkey and Greece. PSI results are compared, validated and integrated with GPS and ground data with the aim of better understanding the pre-earthquake deformation process and the vulnerability of foundation soils to seismic shaking. This should lead to a more effective and standardised approach to monitoring developing hazard and risk of earthquake-prone regions. Preliminary results on Istanbul and NAFZ (Turkey), Ionian Islands and Rio Antirio (Greece) bridge, Messina strait (Italy), a NPP in Lithuania and, finally, results from WAP (Wide Area Processing) in Greece are shown.