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|Title:||Ground deformation from ground-based SAR interferometry|
|Authors:||ANTONELLO Giuseppe; CASAGLI Nicola; FARINA Paolo; FORTUNY GUASCH Joaquim; GUERRI Letizia; LEVA Davide; TARCHI Dario|
|Publisher:||American Geophysical Union|
|Type:||Articles in books|
|Abstract:||An in-depth analysis of the last two images acquired by the ground-based InSAR system installed on Stromboli before the April 5th 2003 explosive event detected the precursory signals of the explosion related to ground deformation. Firstly, the use of a particular interferometric processing for the last two acquisitions, consisting in selecting synthetic sub-apertures from the main ones and creating with these a sequence of interferograms with a high temporal resolution, detected precursory ground deformations of the explosion. These observations, indicating the occurrence of an elastic deformation of a centimetre amplitude which affected the volcanic edifice and started few minutes before the explosion, were confirmed by the seismic signals recorded by the instruments not damaged by the event. Secondly, it was possible to estimate the exact time of the explosion trough the raw data time domain from the radar acquisition. This was interrupted by a blackout occurred few seconds after the event. It corresponds to a clear change in the intensity of the backscattered energy, related to the dense volcanic plume emission from the Crater.|
|JRC Institute:||Institute for the Protection and Security of the Citizen|
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