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InSAR monitoring using RADARSAT-2 data at Piton de la Fournaise (La Reunion) and Karthala (Grande Comore) volcanoes

Thibault Catry, Nicolas Villeneuve, Jean-Luc Froger and Giuseppe Maggio
InSAR monitoring using RADARSAT-2 data at Piton de la Fournaise (La Reunion) and Karthala (Grande Comore) volcanoes (in Detecting, modelling and responding to effusive eruptions, A. J. L. Harris (editor), T. de Groeve (editor), F. Garel (editor) and S. A. Carn (editor))
Special Publication - Geological Society of London (October 2015) 426 (1): 505-532

Abstract

Piton de la Fournaise (La Reunion) and Karthala (Grande Comore) are the two active volcanoes of the Southwestern Indian Ocean. A 14 month (April 2013 to June 2014) monitoring period was carried out at both volcanoes using synthetic aperture RADAR interferometry (InSAR) techniques on RADARSAT-2 data. Thanks to the SEAS-OI (Survey of Environment Assisted by Satellite in the Indian Ocean) station, 21 SAR scenes were acquired over this period and InSAR results revealed the slow subsidence of the Dolomieu caldera floor at Piton de la Fournaise, following the 2009 and 2010 eruptions, and the subsidence of the whole cone between April and July 2013. At Karthala no evidence of any volcanic activity was found for the period April 2013 to June 2014. The use of systematic InSAR for volcano monitoring is an efficient tool to study effusive eruptions. We showed that, during periods of unrest, InSAR is able to pick up early signs of a future eruption and monitor secondary phenomena that require no real-time data. During an effusive crisis, it is still difficult to carry out fully operational InSAR monitoring, but using the example of the June 2014 eruption at Piton de la Fournaise, we show that SAR data can help with the detection and tracking of lava flows and active flow paths during effusive eruptions, based on SAR coherence and SAR amplitude. These preliminary results are very promising for the future of InSAR monitoring of active volcanoes and highlight the need for near-real-time access to SAR data in the mapping of active lava flows during effusive eruptions. This study also revealed the major role of ground stations like SEAS-OI in the efficiency of this monitoring, supplying free, near-real-time remote sensing data to the scientific and institutional communities.


ISSN: 0305-8719
EISSN: 2041-4927
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 426
Serial Issue: 1
Title: InSAR monitoring using RADARSAT-2 data at Piton de la Fournaise (La Reunion) and Karthala (Grande Comore) volcanoes
Title: Detecting, modelling and responding to effusive eruptions
Author(s): Catry, ThibaultVilleneuve, NicolasFroger, Jean-LucMaggio, Giuseppe
Author(s): Harris, A. J. L.editor
Author(s): de Groeve, T.editor
Author(s): Garel, F.editor
Author(s): Carn, S. A.editor
Affiliation: Surveillance de l'Environnement Assistee par Satellite pour l'Ocean Indien, UMR 228 ESPACE-DEV, Saint-Pierre, Reunion
Pages: 505-532
Published: 20151029
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
Number of pages: 28
References: 57
Accession Number: 2016-025852
Categories: Quaternary geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
S21°13'60" - S21°13'60", E55°43'00" - E55°43'00"
S11°45'37" - S11°45'37", E43°21'11" - E43°21'11"
Secondary Affiliation: Observatoire Volcanologique du Piton de la Fournaise, REU, ReunionUniversite Blaise Pascal, FRA, FranceUniversita di Firenze, ITA, Italy
Source Note: Online First
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201613
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