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Opening of an eruptive fissure and seaward displacement at Piton De La Fournaise Volcano measured by RADARSAT satellite radar interferometry
Author(s) -
Sigmundsson Freysteinn,
Durand Philippe,
Massonnet Didier
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900055
Subject(s) - geology , volcano , seismology , interferometric synthetic aperture radar , dike , caldera , impact crater , magma , lateral eruption , satellite , synthetic aperture radar , geodesy , explosive eruption , remote sensing , petrology , physics , aerospace engineering , engineering , astronomy
Interferometric analysis of Synthetic Aperture Radar images acquired by the RADARSAT‐1 satellite of Piton de la Fournaise volcano, show that an eruptive fissure which opened on 9th of March 1998 caused asymmetric deformation, with displacement and bulging of the volcanic edifice on the seaward side of the fissure. Up to 50 cm ground‐to‐satellite range change occurred in a 3‐km wide area, in response to a shallow (< 1‐km‐deep) inclined dike that opened by up to 60 cm. The erupted magma was transported from more than 7‐km‐depth below sea level, causing no observable volcano‐wide co‐eruptive deflation. A series of pre‐eruption interferograms show also that no significant inflation occurred prior to the eruption. The dike injection slightly reduced the stability of the volcano seaward flank.