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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Flare-Shaped Acoustic Anomalies in the Water Column Along the Ecuadorian Margin: Relationship with Active Tectonics and Gas Hydrates</title>
<creator>Michaud, François</creator>
<creator>Proust, Jean-Noël</creator>
<creator>Dano, Alexandre</creator>
<creator>Collot, Jean-Yves</creator>
<creator>Guiyeligou, Grâce Daniella</creator>
<creator>Lebrun, Jean-frederic</creator>
<creator>Et, Al.</creator>
<contributor>Géoazur (GEOAZUR) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Université Nice Sophia Antipolis (UNS) ; Université Côte d'Azur (UCA) - Université Côte d'Azur (UCA) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire de la Côte d'Azur - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Rennes (GR) ; Université de Rennes 1 (UR1) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire des Sciences de l'Univers de Rennes (OSUR) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Service de la Géologie de Nouvelle Calédonie ; Direction de l'Industrie, des Mines et de l'Energie de Nouvelle Calédonie</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0033-4533</source>
<source>EISSN: 1420-9136</source>
<source>Pure and Applied Geophysics</source>
<publisher>Springer-Verlag</publisher>
<identifier>insu-01267238</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-01267238</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-01267238</source>
<source>Pure and Applied Geophysics, Springer-Verlag, 2016, 173, pp.3291-3303. 〈10.1007/s00024-015-1230-7〉</source>
<identifier>DOI : 10.1007/s00024-015-1230-7</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00024-015-1230-7</relation>
<language>en</language>
<subject lang=en>Fluid</subject>
<subject lang=en>Multibeam</subject>
<subject lang=en>Backscatter</subject>
<subject lang=en>Ecuador</subject>
<subject lang=en>Subduction</subject>
<subject lang=en>Continental margin</subject>
<subject lang=en>Seepage</subject>
<subject lang=en>Acoustics.</subject>
<subject>[SDU.STU] Sciences of the Universe [physics]/Earth Sciences</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>With hull-mounted multibeam echosounder data, wereport for the first time along the active Ecuadorian margin,acoustic signatures of water column fluid emissions and seep-relatedstructures on the seafloor. In total 17 flare-shaped acousticanomalies were detected from the upper slope (1250 m) to the shelfbreak (140 m). Nearly half of the flare-shaped acoustic anomaliesrise 200–500 m above the seafloor. The base of the flares is generallyassociated with high-reflectivity backscatter patchescontrasting with the neighboring seafloor. We interpret these flaresas caused by fluid escape in the water column, most likely gases.High-resolution seismic profiles show that most flares occur closeto the surface expression of active faults, deformed areas, slopeinstabilities or diapiric structures. In two areas tectonic deformationdisrupts a Bottom Simulating Reflector (BSR), suggesting thatburied frozen gas hydrates are destabilized, thus supplying free gasemissions and related flares. This discovery is important as it opensthe way to determine the nature and origin of the emitted fluids andtheir potential link with the hydrocarbon system of the forearcbasins along the Ecuadorian margin.</description>
<date>2016</date>
</dc>
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