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dc.contributor.authorSinghroha, Sunny
dc.contributor.authorChand, Shyam
dc.contributor.authorBünz, Stefan
dc.date.accessioned2019-07-31T11:30:01Z
dc.date.available2019-07-31T11:30:01Z
dc.date.embargoEndDate2019-10-26
dc.date.issued2019-04-26
dc.description.abstractGas hydrates occur within sediments on the western Svalbard continental margin and the Vestnesa Ridge, a large sediment drift that extends in a west‐north‐west direction from the margin towards the mid‐ocean ridge. We acquired multi‐component ocean‐bottom seismic (OBS) data at ten locations on the crest area of the eastern segment of the Vestnesa Ridge, an area with active gas seepage. P and S‐wave velocities are estimated using travel time inversion, and SCA/DEM rock physics modeling is used to estimate gas hydrate and free gas saturation at OBS stations. We apply 1‐D Full Waveform Inversion (FWI) at a selected OBS station to study detailed variations of P‐wave velocity near the BSR. High interval P‐wave velocity (Vp≈1.73‐1.82 km/s) and S‐wave velocity (>0.35 km/s) are observed in a layer above the BSR and low interval P‐wave velocity (Vp≈1.28‐1.53 km/s) in a layer below the BSR. We estimate 10‐18% gas hydrate and 1.5‐4.1% free gas saturation at different OBS stations in a layer above and below the BSR, respectively. We find significant variation in gas hydrate and free gas saturation across faults suggesting a structural control on the distribution of gas hydrate and free gas in the Vestnesa Ridge. Differences in gas hydrate saturation derived from P‐wave velocities and earlier estimates obtained from electromagnetic surveys indicate the presence of gas hydrates in faults and fractures. Moreover, beneath some OBS sites, the combined study of P and S‐waves, resistivity and seismic quality factor (Q), suggests the co‐existence of free gas and gas hydrates.en_US
dc.descriptionSource at <a href=https://doi.org/10.1029/2018JB016574>https://doi.org/10.1029/2018JB016574</a>. ©2019. American Geophysical Union. All Rights Reserved.
dc.identifier.citationSinghroha, S., Chand, S. & Bünz, S. (2019). Constraints on Gas Hydrate Distribution and Morphology in Vestnesa Ridge, Western Svalbard Margin, Using Multicomponent Ocean‐Bottom Seismic Data. <i>Journal of Geophysical Research - Solid Earth, 124</i>(5), 4343-4364. https://doi.org/10.1029/2018JB016574en_US
dc.identifier.cristinIDFRIDAID 1698648
dc.identifier.doi10.1029/2018JB016574
dc.identifier.issn2169-9313
dc.identifier.issn2169-9356
dc.identifier.urihttps://hdl.handle.net/10037/15818
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.ispartofSinghroha, S. (2019). Distribution and quantification of gas hydrates and free gas in marine sediments of Vestnesa Ridge, offshore W-Svalbard. (Doctoral thesis). <a href=https://hdl.handle.net/10037/15824>https://hdl.handle.net/10037/15824</a>.
dc.relation.journalJournal of Geophysical Research - Solid Earth
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.rights.accessRightsembargoedAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466en_US
dc.subjectGas hydratesen_US
dc.subjectOBS dataen_US
dc.subjectVelocity modellingen_US
dc.subjectRock physicsen_US
dc.subjectFWIen_US
dc.titleConstraints on Gas Hydrate Distribution and Morphology in Vestnesa Ridge, Western Svalbard Margin, Using Multicomponent Ocean‐Bottom Seismic Dataen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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