Skip to main content
Earth, Planets and Space
Download PDF
  • Article
  • Published:

Acquisition, processing and analysis of densely sampled P- and S-wave OBS-data on the mid-Norwegian Margin, NE Atlantic

Earth, Planets and Space volume 54, pages e1219–e1236 (2002)Cite this article

Abstract

This paper describes the processing and analysis of semi-local OBS-data shot along a 122 km profile in the Vøring Basin, NE Atlantic margin, using both a high-frequency/short shot-spacing and a low-frequency/long shot-spacing air-gun source. Spectral analysis of the data reveals that an important difference between the two sources used, is that the low-frequency source generates significantly more energy around 6 Hz. This higher content of very low frequencies allows detection of arrivals to larger offsets for the low-frequency source. For the nearest offsets (0–20 km) the high-frequency source is able to resolve some more details than the low-frequency source, as far as the shallow to intermediate sedimentary levels are concerned. This is mainly caused by the fact that the high-frequency source has a much sharper primary pulse and reduced bubble pulse compared to the low-frequency source. The data quality can be significantly enhanced by use of band-pass filtering, trace mixing, FK (velocity) filtering, minimum phase predictive deconvolution, as well as Radon filtering. Inspection of particle diagrams documents S-wave splitting, interpreted as microcracks aligned vertically in the sedimentary section by the present day (slightly compressive) stress-field.

References

  • Berg, E. W., L. Amundsen, A. Morton, R. Mjelde, H. Shimamura, H. Shiobara, T. Kanazawa, S. Kodaira, and J. P. Fjellanger, Three component OBS-data processing for lithology and fluid prediction in the mid-Norway margin, NE Atlantic, Earth Planets Space, 53, 75–89, 2001.

    Article  Google Scholar 

  • Bungum, H., A. Alsaker, L. B. Kvamme, and R. A. Hansen, Seismicity and seismotectonics of Norway and nearby continental shelf areas, J. Geophys. Res., 96(B2), 2,249–2,265, 1990.

    Article  Google Scholar 

  • Crampin, S., The scattering of S waves in the crust, Pure and Applied Geophysics, 132, 67–91, 1990.

    Article  Google Scholar 

  • Digranes, P., R. Mjelde, S. Kodaira, H. Shimamura, T. Kanazawa, H. Shiobara, and E. W. Berg, Modelling of shear waves in OBS data from the Vøring Basin (Northern Norway) by 2-D ray-tracing, Pure and Applied Geophysics, 4, 611–629, 1996.

    Article  Google Scholar 

  • Eldholm, O. and K. Grue, North Atlantic volcanic margins: Dimensions and production rates, J. Geophys. Res., 99, 2,955–2,968, 1994.

    Article  Google Scholar 

  • Kanazawa, T, Technical Description of TK92-type ocean bottom seismometer, in Investigation of the Central and Northern Part of the Vøring Basin by Use of Ocean Bottom Seismographs, R/V Håkon Mosby 22 Aug.–24 Sept. 1992, cruise report, Statoil report, Mjelde, R. etal, 1993.

  • Mjelde, R., M. A. Sellevoll, H. Shimamura, T. Iwasaki, and T. Kanazawa, A crustal study off Lofoten, N. Norway by use of 3-C ocean bottom seismographs, Tectonophys., 212, 269–288, 1992.

    Article  Google Scholar 

  • Mjelde, R., M. A. Sellevoll, H. Shimamura, T. Iwasaki, and T. Kanazawa, Crustal structure under Lofoten, N. Norway, from vertical incidence and wide-angle data, Geophys. J. Int., 114, 116–126, 1993.

    Article  Google Scholar 

  • Mjelde, R., M. A. Sellevoll, H. Shimamura, T. Iwasaki, and T. Kanazawa, S-wave anisotropy off Lofoten, Norway, indicative of fluids in the lower crust?, Geophys. J. Int., 120, 87–96, 1995.

    Article  Google Scholar 

  • Mjelde, R., S. Kodaira, H. Shimamura, T. Kanazawa, H. Shiobara, E. W. Berg, and O. Riise, Crustal structure of the central part of the Vøring basin, mid-Norway margin, from three-component ocean bottom seismographs, Tectonophys., 277, 235–257, 1997a.

    Article  Google Scholar 

  • Mjelde, R., S. Kodaira, P. Digranes, H. Shimamura, T. Kanazawa, H. Shiobara, and E. W. Berg, Comparison between a regional and semiregional crustal OBS-model in the Vøring basin, mid-Norway margin, Pure and Applied Geophysics, 149, 641–665, 1997b.

    Article  Google Scholar 

  • Mjelde, R., J. P. Fjellanger, P. Digranes, S. Kodaira, H. Shimamura, and H. Shiobara, Application of the single bubble air-gun technique for OBS-data acquisition across the Jan Mayen Ridge, North Atlantic, Marine Geophysical Researches, 19, 81–96, 1997c.

    Article  Google Scholar 

  • Mjelde, R., P. Digranes, H. Shimamura, H. Shiobara, S. Kodaira, H. Brekke, T. Egebjerg, N. Sørenes, and T. Thorbjørnsen, Crustal structure of the northern part of the Vøring Basin, mid-Norway margin, from wide-angle seismic and gravity data, Tectonophys., 293, 175–205, 1998.

    Article  Google Scholar 

  • Mjelde, R., J. P. Fjellanger, T. Raum, P. Digranes, S. Kodaira, A. Breivik, and H. Shimamura, Where do PS converions occur? Analysis of OBS-data from the NE Atlantic Margin, First Break, 20, 153–160, 2002.

    Article  Google Scholar 

  • Neidell, N. S., Land application of S waves, Geophysics: The Leading Edge of Exploration, 11, 32–44, 1985.

    Google Scholar 

  • Pajchel, J., H. B. Helle, and L. Frøyland, A 2-D seismic Modelling Package, User’s Manual, Geophys. Dep., Norsk Hydro Research Center, Bergen, 1989.

  • Samson, C, P. J. Barton, and J. Karwatowski, Imaging beneath an basaltic layer using densely sampled wide-angle OBS data, Geophysical Prospecting, 43, 509–528, 1995.

    Article  Google Scholar 

  • Sellevoll, M. A., H. Shimamura, A. Gidskehaug, and H. Johnsen, Seismiske undersøkelser av Lofoten marginen og refleksjonsseismiske test-målinger på Mohns Rygg, M/S Håkon Mosby, 29. juli-19. august 1988, Cruise report, IFJ, Univ. of Bergen, 1988.

  • Shiobara, H., A. Nakanishi, H. Shimamura, R. Mjelde, T. Kanazawa, and E. W. Berg, Precise positioning of Ocean Bottom Seismometer by Using Acoustic Transponder and CTD, Marine Geophysical Researches, 19, 199–209, 1997.

    Article  Google Scholar 

  • Trevorrow, M. V, T. Yamamoto, A. Turget, D. Goodman, and M. Badiey, Very low frequency ocean bottom ambient seismic noise and coupling on the shallow continental shelf, Marine Geophys. Res., 11, 129–152, 1989.

    Article  Google Scholar 

  • Webb, S. C. and C. S. Cox, Observations and modeling of seafloor microseisms, J. Geophys. Res., 91, 7343–7358, 1986.

    Article  Google Scholar 

Download references

Author information

Author notes

  1. Rolf Mjelde & Hajime Shiobara

    Present address: Earthquake Research Institute, University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo, 113-0032, Japan

  2. Shuichi Kodaira & Ayako Nakanishi

    Present address: JAMSTEC, 2-15 Natsushima-cho, Yokosuka-city, Kanagawa, 237-0061, Japan

Authors and Affiliations

  1. Institute of Solid Earth Physics, University of Bergen, Allégt. 41, 5007, Bergen, Norway

    Rolf Mjelde

  2. Institute of Solid Earth Physics, University of Bergen, 5007, Norway

    Tommy Timenes

  3. Institute for Seismology and Volcanology, Hokkaido University, Sapporo, 060, Japan

    Hideki Shimamura, Hajime Shiobara, Shuichi Kodaira & Ayako Nakanishi

  4. Earthquake Research Institute, University of Tokyo, Tokyo, 113-0032, Japan

    Toshihiko Kanazawa

Authors
  1. Rolf Mjelde
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Tommy Timenes
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Hideki Shimamura
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Toshihiko Kanazawa
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Hajime Shiobara
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. Shuichi Kodaira
    View author publications

    You can also search for this author in PubMed Google Scholar

  7. Ayako Nakanishi
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Rolf Mjelde.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Mjelde, R., Timenes, T., Shimamura, H. et al. Acquisition, processing and analysis of densely sampled P- and S-wave OBS-data on the mid-Norwegian Margin, NE Atlantic. Earth Planet Sp 54, e1219–e1236 (2002). https://doi.org/10.1186/BF03352451

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1186/BF03352451

Keywords