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Occurrence, distribution and expression of gas seeps and gas hydrates on the northeastern continental slope of Sakhalin Island, Sea of Okhotsk

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dc.contributor.authorJin, Young Keun-
dc.contributor.authorB. Baranov-
dc.contributor.authorA. Obzhirov-
dc.contributor.authorH. Shoji-
dc.date.issued2012-
dc.identifier.urihttps://repository.kopri.re.kr/handle/201206/8409-
dc.description.abstractMultidisciplinary surveys were conducted to investigate gas seepage and gas hydrate accumulation on the northeastern Sakhalin continental slope (NESS), Sea of Okhotsk, during joint Korea-Russia-Japan expeditions conducted from 2003 to 2007 (CHAOS and SSGH projects). One hundred sixty one gas seeps were detected in a 2000 km2 area of the NESS (between 53°45′N and 54°45′N). Active gas seeps in a gas hydrate province on the NESS were evident from features in the water column, on the seafloor, and in the subsurface: well-defined hydroacoustic anomalies (gas flares), side-scan sonar structures with high backscatter intensity (seepage structures), bathymetric structures (pockmarks and mounds), gas- and gas-hydrate-related seismic features (bottom-simulating reflectors, gas chimneys, high-amplitude reflectors, and acoustic blanking), high methane concentrations in seawater, and gas hydrates in sediment near the seafloor. These expressions were generally spatially related; a gas flare would be associated with a seepage structure (mound), below which a gas chimney was present. The spatial distribution of gas seeps on the NESS is controlled by four types of geological structures: faults, the shelf break, seafloor canyons, and submarine slides. Gas chimneys that produced enhanced reflection on high-resolution seismic profiles are interpreted as active pathways for upward gas migration to the seaf007 (CHAOS and SSGH projects). One hundred sixty one gas seeps were detected in a 2000 km2 area of the NESS (between 53°45′N and 54°45′N). Active gas seeps in a gas hydrate province on the NESS were evident from features in the water column, on the seafloor, and in the subsurface: well-defined hydroacoustic anomalies (gas flares), side-scan sonar structures with high backscatter intensity (seepage structures), bathymetric structures (pockmarks and mounds), gas- and gas-hydrate-related seismic features (bottom-simulating reflectors, gas ch-
dc.languageEnglish-
dc.titleOccurrence, distribution and expression of gas seeps and gas hydrates on the northeastern continental slope of Sakhalin Island, Sea of Okhotsk-
dc.title.alternativeOccurrence, distribution and expression of gas seeps and gas hydrates on the northeastern continental slope of Sakhalin Island, Sea of Okhotsk-
dc.typeProceeding-
dc.identifier.bibliographicCitationJin, Young Keun, et al. 2012. Occurrence, distribution and expression of gas seeps and gas hydrates on the northeastern continental slope of Sakhalin Island, Sea of Okhotsk. GRC. GRC. 2012.11.16~.-
dc.citation.volume1-
dc.citation.number1-
dc.citation.conferenceDate2012.11.16~-
dc.citation.conferenceNameGRC-
dc.citation.conferencePlaceGRC-
dc.description.articleClassificationPro(초록)국외-
dc.subject.keywordCHAOS-
dc.subject.keywordgas hydrate-
dc.subject.keywordgas seep-
dc.subject.keywordokhotsk sea-
dc.subject.keywordsakhalin-
dc.identifier.localId2012-0453-
Appears in Collections  
2012-2013, Russia Sakhalin Slope Methane hydrate International Research Project (12-13) / Jin, Young Keun
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