Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/2670
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dc.contributor.authorallMarinaro, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallEtiope, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallLo Bue, N.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallFavali, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.authorallPapatheodorou, G.; Department of Geology, University of Patras, Greeceen
dc.contributor.authorallChristodoulou, D.; Department of Geology, University of Patras, Greeceen
dc.contributor.authorallFurlan, F.; TECNOMARE-ENI SpA,en
dc.contributor.authorallGasparoni, F.; TECNOMARE-ENI SpA,en
dc.contributor.authorallFerentinos, G.; Department of Geology, University of Patras, Greeceen
dc.contributor.authorallMasson, M.; Franatech GmbH, 21339 Luneburg, Germanyen
dc.contributor.authorallRolin, J. F.; IFREMER, Franceen
dc.date.accessioned2007-10-15T10:43:36Zen
dc.date.available2007-10-15T10:43:36Zen
dc.date.issued2006en
dc.identifier.urihttp://hdl.handle.net/2122/2670en
dc.description.abstractA new seafloor observatory, the gas monitoring module (GMM), has been developed for continuous and long-term measurements of methane and hydrogen sulphide concentrations in seawater, integrated with temperature (T), pressure (P) and conductivity data at the seafloor. GMM was deployed in April 2004 within an active gas-bearing pockmark in the Gulf of Patras (Greece), at a water depth of 42 m. Through a submarine cable linked to an onshore station, it was possible to remotely check, via direct phone connection, GMM functioning and to receive data in nearreal time. Recordings were carried out in two consecutive campaigns over the periods April–July 2004, and September 2004–January 2005, amounting to a combined dataset of ca. 6.5 months. This represents the first long-term monitoring ever done on gas leakage from pockmarks by means of CH4+H2S+T+P sensors. The results show frequent T and P drops associated with gas peaks, more than 60 events in 6.5 months, likely due to intermittent, pulsation-like seepage. Decreases in temperature in the order of 0.1–1°C (up to 1.7°C) below an ambient T of ca. 17°C (annual average) were associated with short-lived pulses (10–60 min) of increased CH4+H2S concentrations. This seepage “pulsation” can either be an active process driven by pressure build-up in the pockmark sediments, or a passive fluid release due to hydrostatic pressure drops induced by bottom currents cascading into the pockmark depression. Redundancy and comparison of data from different sensors were fundamental to interpret subtle proxy signals of temperature and pressure which would not be understood using only one sensor.en
dc.language.isoEnglishen
dc.publisher.nameSpringer-Verlagen
dc.relation.ispartofGeo-Mar Letten
dc.relation.ispartofseries5 / 26 (2006)en
dc.subjectmethane-seepingen
dc.titleMonitoring of a methane-seeping pockmark by cabled benthic observatory (Patras Gulf, Greece)en
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber297-302en
dc.subject.INGV03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gasesen
dc.subject.INGV04. Solid Earth::04.04. Geology::04.04.04. Marine geologyen
dc.identifier.doi10.1007/s00367-006-0040-4en
dc.description.journalTypeJCR Journalen
dc.description.fulltextreserveden
dc.contributor.authorMarinaro, G.en
dc.contributor.authorEtiope, G.en
dc.contributor.authorLo Bue, N.en
dc.contributor.authorFavali, P.en
dc.contributor.authorPapatheodorou, G.en
dc.contributor.authorChristodoulou, D.en
dc.contributor.authorFurlan, F.en
dc.contributor.authorGasparoni, F.en
dc.contributor.authorFerentinos, G.en
dc.contributor.authorMasson, M.en
dc.contributor.authorRolin, J. F.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italiaen
dc.contributor.departmentDepartment of Geology, University of Patras, Greeceen
dc.contributor.departmentDepartment of Geology, University of Patras, Greeceen
dc.contributor.departmentTECNOMARE-ENI SpA,en
dc.contributor.departmentTECNOMARE-ENI SpA,en
dc.contributor.departmentDepartment of Geology, University of Patras, Greeceen
dc.contributor.departmentFranatech GmbH, 21339 Luneburg, Germanyen
dc.contributor.departmentIFREMER, Franceen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia-
crisitem.author.deptDepartment of Geology, University of Patras, Greece-
crisitem.author.deptDepartment of Geology, University of Patras, Greece-
crisitem.author.deptTecnomare-ENI SpA-
crisitem.author.deptTecnomare SpA-
crisitem.author.deptDepartment of Geology, University of Patras, Greece-
crisitem.author.deptFranatech GmbH, 21339 Luneburg, Germany-
crisitem.author.deptIFREMER, France-
crisitem.author.orcid0000-0002-6779-279X-
crisitem.author.orcid0000-0001-8614-4221-
crisitem.author.orcid0000-0002-5160-941X-
crisitem.author.orcid0000-0002-0810-0263-
crisitem.author.orcid0000-0002-3012-6865-
crisitem.author.orcid0000-0002-4151-7909-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent03. Hydrosphere-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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