Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/12229
Authors: Papageorgiou, Elena* 
Foumelis, Michael* 
Trasatti, Elisa* 
Ventura, Guido* 
Raucoules, Daniel* 
Mouratidis, Antonios* 
Title: Multi-Sensor SAR Geodetic Imaging and Modelling of Santorini Volcano Post-Unrest Response
Issue Date: Jan-2019
Series/Report no.: /11 (2019)
DOI: 10.3390/rs11030259
URI: http://hdl.handle.net/2122/12229
Keywords: remote sensing
geodetic modelling
santorini volcano
unrest
Subject Classification04.08. Volcanology 
Abstract: Volcanic history of Santorini over recent years records a seismo-volcanic unrest in 2011–12 with a non-eruptive behavior. The volcano deformation state following the unrest was investigated through multi-sensor Synthetic Aperture Radar Interferometry (InSAR) time series. We focused on the analysis of Copernicus Sentinel-1, Radarsat-2 and TerraSAR-X Multi-temporal SAR Interferometric (MT-InSAR) results, for the post-unrest period 2012–17. Data from multiple Sentinel-1 tracks and acquisition geometries were used to constrain the E-W and vertical components of the deformation field along with their evolution in time. The interpretation of the InSAR observations and modelling provided insights on the post-unrest deformation pattern of the volcano, allowing the further re-evaluation of the unrest event. The increase of subsidence rates on Nea Kameni, in accordance with the observed change of the spatial deformation pattern, compared to the pre-unrest period, suggests the superimposition of various deformation sources. Best-fitting inversion results indicate two deflation sources located at southwestern Nea Kameni at 1 km depth, and in the northern intra-caldera area at 2 km depth. A northern sill-like source interprets the post-unrest deflation attributed to the passive degassing of the magma intruded at 4 km during the unrest, while an isotropic source at Nea Kameni simulates a prevailing subsidence occurring since the pre-unrest period (1992–2010).
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