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Marine Geophysical Researches

, Volume 28, Issue 1, pp 27–41 | Cite as

Gravity and S-wave modelling across the Jan Mayen Ridge, North Atlantic; implications for crustal lithology

  • Rolf MjeldeEmail author
  • Inger Eckhoff
  • Ståle Solbakken
  • Shuichi Kodaira
  • Hideki Shimamura
  • Karl Gunnarsson
  • Ayako Nakanishi
  • Hajime Shiobara
Original Paper

Abstract

The horizontal components from fourteen Ocean Bottom Seismometers deployed along four profiles focused along the western margin of the Jan Mayen microcontinent, North Atlantic, have been modelled with regard to S-waves, based on P-wave models obtained earlier. The seismic models have furthermore been constrained by 2D gravity modelling. High V p/V s-ratios (2.3–7.9) within the Cenozoic sedimentary section are attributed to significant porosities, whereas V p/V s-ratios in the order of 1.9–2.2 for the Mesozoic and Paleozoic sedimentary rocks indicate shale-dominated lithology throughout the area. The eastern side of the Jan Mayen Ridge is interpreted as a passive, volcanic margin, based on relatively high crustal V p/V s-ratios (1.9), whereas lower V p/V s-ratios (1.75–1.8) suggest the presence of intermediate composition crust and non-volcanic margin on the western side of the ridge. In the westernmost part of the Jan Mayen Basin, slightly increased upper mantle V p/V s-ratios may indicate some degree of serpentization of upper mantle peridotites.

Keywords

Gravity Modelling Mafic Intrusion Ocean Bottom Seismograph Crystalline Crust Paleozoic Sedimentary Rock 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We thank the crew of R/V Håkon Mosby and the technical staff and students from the Department of Earth Science, University of Bergen, and the Laboratory for Ocean Bottom Seismology, Hokkaido University, for their support and skills during the acquisition of the data. We acknowledge Icelandic, Danish and Norwegian authorities for providing the necessary permits and information for the survey. A part of the survey was funded by the Ministry of Education, Science and Culture of Japan.

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Copyright information

© Springer Science+Business Media, B.V. 2007

Authors and Affiliations

  • Rolf Mjelde
    • 1
    Email author
  • Inger Eckhoff
    • 1
  • Ståle Solbakken
    • 1
  • Shuichi Kodaira
    • 2
    • 3
  • Hideki Shimamura
    • 2
  • Karl Gunnarsson
    • 4
  • Ayako Nakanishi
    • 2
    • 3
  • Hajime Shiobara
    • 2
    • 5
  1. 1.Department of Earth ScienceUniversity of BergenBergenNorway
  2. 2.Institute of Seismology and VolcanologyHokkaido UniversitySapporoJapan
  3. 3.JAMSTECYokosukaJapan
  4. 4.National Energy AuthorityReykjavikIceland
  5. 5.OHRC, Earthquake Research InstituteUniversity of TokyoBunkyo-kuJapan

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