Ground deformation monitoring at the Phlegrean Fields (Naples, Italy) from the exploitation of SAR data in the framework of CAT-1 and DUP activities

Sven Borgstrom(1) , Ida Aquino(1) , Carlo Del Gaudio(1) , Ciro Ricco(1) , Valeria Siniscalchi(1) , Giuseppe Solaro(1) , Pietro Tizzani(1) , and Giovanni Pasquale Ricciardi(1)

(1) Istituto Nazionale di Geofisica e Vulcanologia, Via Diocleziano, 328, 80124 Napoli, Italy

Abstract

The presentation is focused on the main results obtained in the framework of CAT-1 (1065- Integration of SAR Interferometry with classical geodetic techniques for ground deformation monitoring in the Neapolitan volcanic area) and DUP (MINERVA, Monitoring by INterferometric SAR of Environmental Risk in Volcanic Areas) activities, aimed at the integration of EO (ERS/ENVISAT) data with geodetic data from ground networks (mainly GPS and levelling) for ground deformation monitoring in the Phlegrean Fields volcanic area, which gave bradyseismic activity in recent time. Differential SAR Interferometry is a powerful technique for the geodetical monitoring of the area, as the information retrieved has been always comparable, both in space and time, with terrestrial data. Moreover, the information from spaceborne sensors is more effective in comparison with ground data, as it covers a wide area with an higher temporal sampling, if compared to the mean repetition time of field measurements. Besides SAR data processing, also a network of Corner Reflectors (CR) in the whole Neapolitan Volcanic District has been partially installed, in order to increase SAR data resolution in areas with low or no coherence: in particular 8 CR (4 couples) were already installed in the Solfatara crater, which is marked by a different dynamics in comparison with the whole Phlegrean system and therefore of remarkable interest from the scientific point of view.

 

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