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Mapping ground velocity in Italian seismogenic areas by InSAR techniques: the VELISAR initiative.

Stefano Salvi(1), Carlo Alberto Brunori(1), Cristiano Tolomei(1), Simone Atzori(1), Salvatore Stramondo(1), Fawzi Doumaz(1), Alessandro Ferretti(2), Stefano Cespa(2), Giovanni Ricciardi(3), Giuseppe Solaro(3) and Riccardo Lanari(4)

(1) Istituto Nazionale di Geofisica e Vulcanologia, via di Vigna Murata, 605, 00143, Roma, Italy
(2) TRE Tele-Rilevamento Europa, Via Vittoria Colonna, 7, 20149, Milano, Italy
(3) Istituto Nazionale di Geofisica e Vulcanologia, Via Diocleziano, 328, 80124, Napoli, Italy
(4) CNR - IREA, Via Diocleziano, 328, 80124, Napoli, Italy


The Istituto nazionale di Geofisica e Vulcanologia (INGV) has started the VELISAR research initiative, with the scope to produce a high-resolution ground deformation data set for a better understanding of the seismic cycle in the italian seismogenic areas. Therefore most of the Central-South Italian Paeninsula, Sicily island and part of the Regione Emilia-Romagna have been investigated. Ground velocity maps will be generated for such areas using multi-temporal SAR Interferometry techniques. In particular, VELISAR wants to exploit the information content of the archived ERS 1-2 data from 1992 to 2001, and for this it will make use of advanced processing methodologies for time-series InSAR, as the PS (Permanent Scatterers) and SBAS (Small BAseline Subset) techniques. The dataset is composed by some thousands of ERS images, and the resulting ground velocity maps will be validated by means of independent space and ground geodetic data. A key target of the VELISAR initiative is to make available to the scientific community the InSAR results, and this is accomplished through a dedicated web site, open also to the general public. We will present the initiative, its scope and the results obtained so far.


Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry