Vis enkel innførsel

dc.contributor.authorJohansen, Tor Arne
dc.contributor.authorRuud, Bent Ole
dc.contributor.authorTømmerbakke, Ronny
dc.contributor.authorJensen, Kristian
dc.date.accessioned2020-03-26T08:15:30Z
dc.date.available2020-03-26T08:15:30Z
dc.date.issued2019-02-09
dc.description.abstractGeophysical surveying of the Arctic will become increasingly important in future prospecting and monitoring of the terrestrial and adjacent areas in this hemisphere. Seismic data acquired on floating ice are hampered with extensive noise due to ice vibrations related to highly dispersive ice flexural waves generated by the seismic source. Several experiments have been conducted on floating ice in van Mijenfjorden in Svalbard in the Norwegian Arctic to specifically analyse the extent of flexural waves recorded with various seismic receivers and sources deployed both on top of ice and in the water below. The data show that flexural waves are severely damped at 5 m or deeper below the ice and hydrophone data suffer less from these vibrations compared with data recorded on the ice. Aliasing of single receiver hydrophone data can to some extent be suppressed using an in‐line line source of detonating cord. Experiments on ice on shallow water show prominent guided wave modes often referred to as Scholte waves propagating along the seabed. In this case, both flexural and Scholte waves interfere and make a complicated pattern of coherent noise. On shallow water, the positioning and type of the seismic source must be evaluated with respect to the coherent noise generated by these waves. Geophone strings of 25 m effectively suppress both flexural and Scholte waves due to their relative short wavelengths. An airgun generates relative more low‐frequency energy than a surface source of detonating cord. Accordingly, seismic mapping of deep seismic horizons seem to be best achieved using geophone strings of such length and an airgun source. For shallow targets, the use of hydrophones in combination with detonating cord is an appropriate solution. Seismic surveying in the Arctic always have to follow environmental restrictions of not disturbing or harming wildlife and not causing permanent footprints into the vulnerable tundra, which implies that the choice of seismic acquisition strategy might occur as a trade‐off between optimum data quality and environmental constraints.en_US
dc.identifier.citationJohansen, T.A; Ruud, B.O.; Tømmerbakke, R.; Jensen, K.(2019) Seismic on floating ice: data acquisition versus flexural wave noise. <i>Geophysical Prospecting, 67, </i>(3), 532-549en_US
dc.identifier.cristinIDFRIDAID 1705109
dc.identifier.doi10.1111/1365-2478.12756
dc.identifier.issn0016-8025
dc.identifier.issn1365-2478
dc.identifier.urihttps://hdl.handle.net/10037/17857
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalGeophysical Prospecting
dc.relation.projectIDNorges forskningsråd: 228107en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2019 European Association of Geoscientists & Engineersen_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleSeismic on floating ice: data acquisition versus flexural wave noiseen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel