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Open AccessArticle

Multi-Sensor SAR Geodetic Imaging and Modelling of Santorini Volcano Post-Unrest Response

1
School of Geology, Aristotle University of Thessaloniki (AUTh), 54124 Thessaloniki, Greece
2
BRGM—French Geological Survey, 3 Claude-Guillemin, 45060 Orléans, France
3
Istituto Nazionale di Geofisica e Vulcanologia (INGV), 605 Via di Vigna Murata, 00143 Roma, Italy
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(3), 259; https://doi.org/10.3390/rs11030259
Received: 25 December 2018 / Revised: 22 January 2019 / Accepted: 24 January 2019 / Published: 28 January 2019
(This article belongs to the Special Issue Remote Sensing of Volcanic Processes and Risk)
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). View Full-Text
Keywords: volcano deformation; SAR interferometry; post-unrest deflation; inversion modelling; Santorini volcano deformation; SAR interferometry; post-unrest deflation; inversion modelling; Santorini
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Papageorgiou, E.; Foumelis, M.; Trasatti, E.; Ventura, G.; Raucoules, D.; Mouratidis, A. Multi-Sensor SAR Geodetic Imaging and Modelling of Santorini Volcano Post-Unrest Response. Remote Sens. 2019, 11, 259.

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