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Reinterpretation of the RRISP-77 Iceland shear-wave profiles

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dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Menke, William
dc.contributor.author Brandsdóttir, Bryndís
dc.contributor.author Einarsson, Páll
dc.contributor.author Bjarnason, Ingi Þorleifur
dc.date.accessioned 2018-02-13T13:35:51Z
dc.date.available 2018-02-13T13:35:51Z
dc.date.issued 1996-07
dc.identifier.citation Menke, W., Brandsdóttir, B., Einarsson, P. and Bjarnason, I. Th. (1996), Reinterpretation of the RRISP-77 Iceland shear-wave profiles. Geophysical Journal International, 126: 166–172. doi: 10.1111/j.1365-246X.1996.tb05275.x
dc.identifier.issn 0956-540X
dc.identifier.issn 1365-246X (eISSN)
dc.identifier.uri https://hdl.handle.net/20.500.11815/567
dc.description.abstract Two shear-wave profiles, E and G, collected during the 1977 Reykjanes Ridge Iceland Seismic Experiment have played an important role in models of the Icelandic crust. They were originally interpreted as indicating very low shear-wave velocities and abnormally low shear-wave quality factors in the 10–15 km depth range. These attributes, which are indicative of near-solidus temperatures, were used to support the hypothesis that the crust of Iceland is relatively thin (10–15 km) and underlain by partially molten material. More recent seismic data, however, contradict this hypothesis and suggest that the crust is thicker (20–30 km) and cooler. A re-examination of the RRISP-77 data indicates that the low shear-wave velocities are artefacts arising from source static anomalies (in the case of profile G) and misidentification of a secondary shear phase, SmS, as S (in the case of profile E). Furthermore, the attenuation occurs at ranges when rays from the shots pass near the Askja (profile E) and Katla and Oraefajokull (profile G) volcanoes. It may therefore have a localized source, and not be diagnostic of Icelandic crust as a whole. This new interpretation of the RRISP-77 shear-wave data is consistent with models having a thick, cold crust.
dc.description.sponsorship We thank 0. Flovenz, one of the principal investigators of the SIST experiment, G. Foulger and B. Julian, principal investigators of the Hengill experiment, and the Incorporated Research Institutions for Seismology for providing us with copies of the data. Lamont Doherty Contribution Number 5513
dc.format.extent 166-172
dc.language.iso en
dc.publisher Oxford University Press (OUP)
dc.relation.ispartofseries Geophysical Journal International;126(1)
dc.rights info:eu-repo/semantics/openAccess
dc.subject Geophysics
dc.subject Crust
dc.subject Iceland
dc.subject Reykjanes Rigde
dc.subject S waves
dc.subject Jarðeðlisfræði
dc.subject Jarðskorpa
dc.subject Jarðskorpuhreyfingar
dc.subject Bylgjufræði
dc.subject Reykjaneshryggur
dc.title Reinterpretation of the RRISP-77 Iceland shear-wave profiles
dc.type info:eu-repo/semantics/article
dc.description.version Peer Reviewed
dc.identifier.journal Geophysical Journal International
dc.identifier.doi 10.1111/j.1365-246X.1996.tb05275.x
dc.relation.url http://academic.oup.com/gji/article-pdf/126/1/166/6043966/126-1-166.pdf
dc.contributor.department Raunvísindastofnun (HÍ)
dc.contributor.department Science Institute (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)

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