Skip to main content

Regional and semi-regional modelling of wide-angle shear waves in OBS data from the Vøring Basin, N. Norway—a comparison

Abstract

Shear wave refractions and wide-angle reflections recorded on densely spaced Ocean Bottom Seismometers (OBSs) in the Vøring Basin have been modelled by use of 2-D kinematic ray-tracing. Twenty-five three component OBSs were deployed along a 120 km long profile, and the semi-regional shear-wave velocity model derived from modelling the horizontal components is compared with a regional model from 5 OBSs along the same profile. The overall shear-wave velocity distribution of the two models are fairly similar, proving that the regional procedure with large OBS spacing provides a reliable regional shear-wave velocity model. The semi-regional model is more detailed than the regional model due to the much closer receiver spacing. The vertical resolution is improved, especially in the shallow sediments, and this enables a more detailed lithological interpretation to be carried out. Intermediate and deep sediments are also better resolved in the semi-regional model, indicating both vertical and lateral changes in the lithology. The V p /V s ratio inferred for the crystalline basement is 1.75 in both models, considered to be typical for the continental crust. An increase in the V p /V s ratio in the lower crust is observed both in the regional and in the semi-regional model. This indicates a more mafic composition in the lower crust, supporting the interpretation that the lower crust is a “mixing” of continental crust and magmatic underplating.

References

  • Asada, T., T. Kanazawa, and H. Shimamura, A pop-up type ocean bottom seismograph, Prog. Abstr. Seism. Soc. Japan, 114, 1979 (in Japanese).

  • Barton, C, D. Moos, and J.-P. Blangy, Analysis of full waveform acoustic logging data at ODP site 642—outer Vøring Plateau, in Proc. ODP, Sci. Results, 104, edited by O. Eldholm, J. Thiede, and J. Taylor, College Station, TX (Ocean Drilling Program), pp. 953–964, 1989.

  • Berndt, C, O. P. Skogly, S. Planke, O. Eldholm, and R. Mjelde, High-velocity breakup-related sills in the Vøring Basin, off Norway, J. Geophys. Res., 105, 28443–28454, 2000.

    Article  Google Scholar 

  • Blystad, P., H. Brekke, R. B. Færseth, B. T. Larsen, J. Skogseid, and B. Tørudbakken, Structural elements of the Norwegian continental shelf. Part 2: The Norwegian Sea Region, NPD Bull., 8, (Norwegian Petroleum Directorate), 1995.

  • Bromirski, P. D., L. N. Frazer, and F. K. Dunnebier, Sediment shear Q from airgun OBS data, Geophys. J. Int., 110, 465–485, 1992.

    Article  Google Scholar 

  • Bøen, F., S. Eggen, and J. Vollset, Structures and basins of the margin from 62–69°N and their development, in Petroleum Geology of the North European Margin, edited by A. M. Spencer, et al., pp. 3–28, Graham and Trotman, London, 1984.

    Google Scholar 

  • Castagna, J. P., M. L. Batzle, and R. L. Eastwood, Relationships between compressional wave and shear wave velocities in clastic silicate rocks, Geophysics, 50, 571–581, 1985.

    Article  Google Scholar 

  • Chian, D. and K. E. Louden, The continent-ocean crustal transition across the southwest Greenland margin, J. Geophys. Res., 99, 9117–9135, 1994.

    Article  Google Scholar 

  • Christensen, N. I., Poisson’s ratio and crustal seismology, J. Geophys. Res., 101, 3139–3156, 1996.

    Article  Google Scholar 

  • Chung, T. W., N. Hirata, and R. Sato, Two-dimensional P- and S-wave velocity structure of the Yamato Basin, the southern Japan sea, from refraction data collected by an ocean bottom seismographic array, J. Phys. Earth, 38, 99–147, 1990.

    Article  Google Scholar 

  • Dalland, A., D. Worsley, and K. Ofstad, A lithostratigraphic scheme for the Mesozoic and Cenozoic succesion offshore Norway north of 62°N, Norw. Petrol. Dir. Bull. No (ISBN 82-7275-241-9), 67 pp., 1988.

    Google Scholar 

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

    Article  Google Scholar 

  • Digranes, P., R. Mjelde, S. Kodaira, H. Shimamura, T. Kanazawa, H. Shiobara, and E. W. Berg, A regional shear-wave velocity model in the central Vøring Basin, N. Norway, using three-component Ocean Bottom Seismographs, Tectonophys., 293, 157–174, 1998.

    Article  Google Scholar 

  • Domenico, S. N., Rock lithology and porosity determination from shear and compressional wave velocity, Geophysics, 49, 1188–1195, 1984.

    Article  Google Scholar 

  • Doré, A. G., The structural foundation and evolution of Mesozoic seaways between Europe and the Arctic, Pal. Pal. Pal., 87, 441–492, 1991.

    Article  Google Scholar 

  • Eldholm, O. and K. Grue, North Atlantic volcanic margins: Dimensions and production rates, J. Geophys. Res., 99, 2955–2968, 1994.

    Article  Google Scholar 

  • Eldholm, O. and J. C. Mutter, Basin structure of the Norwegian Margin from analysis of digitally recorded sonobuoys, J. Geophys. Res., 91, 3763–3783, 1986.

    Article  Google Scholar 

  • Eldholm, O., J. Thiede, and E. Taylor, Evolution of the Norwegian Continental Margin: Background and Objectives, in Init. Reports (Pt. A), ODP, 104, edited by O. Eldholm, J. Thiede, and E. Taylor, pp. 5–25, 1987.

  • Eldholm, O., J. Thiede, and E. Taylor, Evolution of the Vøring Volcanic Margin, in Proc. ODP, Sci. Results, 104, edited by O. Eldholm, J. Thiede, and E. Taylor, College Station, TX (Ocean Drilling Program), pp. 1033–1065, 1989.

  • Eldholm, O., J. Skogseid, E. Sundvor, and A. M. Myhre, The Norwegian-Greenland Sea, in The Geology of North America, vol. L, The Arctic Ocean Region, The Geological Society of America, pp. 351–363, 1990.

  • Hamilton, E. L., Shear Wave Velocity Versus Depth in Marine Sediments: A Review, Geophysics, 41, 985–996, 1976.

    Article  Google Scholar 

  • Hamilton, E. L., Vp/Vs and Poisson’s ratio in marine sediments and rocks, J. Acoust. Soc. Am., 66, 1093–1101, 1979.

    Article  Google Scholar 

  • Holbrook, W. S., W. D. Mooney, and N. J. Christensen, The seismic velocity structure of the deep continental crust, in Continental Lower Crust, edited by D. M. Fountain, R. Arculus, and R. W. Kay, Development in Geotectonics 23, Elsevier, Amsterdam, pp. 1–43, 1992.

    Google Scholar 

  • Holbrook, W. S., E. C. Reiter, G. M. Purdy, D. Sawyer, P. L. Stoffa, J. A. Austin, J. Oh, and J. Makris, Deep structure of the U.S. Atlantic continental margin, offshore South Carolina, from coincident ocean bottom and multichannel seismic data, J. Geophys. Res., 99, 9155–9178, 1994.

    Article  Google Scholar 

  • Hovland, H., Norsar 2D Ray modelling version 3.0, User’s manual, Norsar, Kjeller, 1994.

    Google Scholar 

  • Iwasaki, T., Ray-tracing program for study of velocity structure by ocean bottom profiling, Zisin, 41, 263–266, 1988 (in Japanese).

    Google Scholar 

  • Kanazawa, T., A seven component, a low power consumption and an acoustic comandable ocean bottom seismograph, Prog. Abstr. Seism. Soc. Japan, 2, 240, 1986 (in Japanese).

    Google Scholar 

  • Kanazawa, T, Technical Description of TK92-type ocean bottom seismometer, Investigation of the central and northern part of the Vøring Basin by use of Ocean Bottom Seismographs, R/V Hakon Mosby 22 aug.-24 sept. 1992, cruise report, Mjelde, R., 1993.

  • Kennett, B. L. N., How does the shear-wave structure of the seabed affect the seismic wavefield?, Geophys. J. Int., 124, 341–348, 1996.

    Article  Google Scholar 

  • Kim, N. W. and A. J. Seriff, Marine PSSP reflections with a bottom velocity transition Zone, Geophysics, 57, 161–170, 1992.

    Article  Google Scholar 

  • Kodaira, S., M. Bellenberg, T. Iwasaki, T. Kanasawa, H. B. Hirschleber, and H. Shimamura, Vp/Vs ratio structure of the Lofoten continental margin, northern Norway, and its geological implications, Geophys. J. Int., 124, 724–740, 1996.

    Article  Google Scholar 

  • Larsen, V. B., A synthesis of tectonically-related stratigraphy in the North Atlantic-Arctic region from Aalenian to Cenomanian time, Norsk Geologisk Tidsskrift, 67, 281–293, 1987.

    Google Scholar 

  • Larsen, B. T., R. Krigsvoll, and O. R. Heum, Structural style and tectonic development of the Haltenbanken area, Mid-Norway, (abstract), Norwegian Petrol. Soc. conf. on structural and tectonic modelling and its application to petroleum geology, Stavanger, 18–20 October 1989, 1989.

  • Mjelde, R. and M. A. Sellevoll, Possible shallow crustal S-wave anisotropy off Lofoten, Norway, inferred from 3-C Ocean Bottom Seismographs, Geophys. J. Int., 115, 159–167, 1993.

    Article  Google Scholar 

  • Mjelde, R., A. Strøm, E. W. Berg, H. Shimamura, T. Kanazawa, H. Shiobara, S. Kodaira, and J. P. Fjellanger, Investigation of the central and northern part of the Vøring Basin by use of Ocean Bottom Seismographs, R/V Hakon Mosby 22 aug.-24 sept. 1992, Cruise report, Statoil, 1993.

  • Mjelde, R., E. W. Berg, A. Strøm, O. Riise, H. Shimamura, T. Kanazawa, H. Shiobara, S. Kodaira, and J. P. Fjellanger, An extensive Ocean Bottom Seismograph survey in the Vøring Basin, N. Norway, First Break, 14, 247–256, 1996a.

    Article  Google Scholar 

  • Mjelde, R., B. Myhre, M. A. Sellevoll, H. Shimamura, T. Iwasaki, and T. Kanazawa, Modelling of S-waves from an area covered with flood-basalts off Lofoten, N. Norway, Geoph. Trans., 40(1), 95–117, 1996b.

    Google Scholar 

  • Mjelde, R., S. Kodaira, R. K. Hassan, A. Goldschmidt-Rokita, N. Tomita, M. A. Sellevoll, H. B. Hirschleber, H. Shimamura, T. Iwasaki, and T. Kanazawa, The continental/ocean transition of the Lofoten volcanic margin, N. Norway,J. Geodynam., 22, 189–206, 1996c.

    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, N. Norway, 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, E. W. Berg, and O. Riise, Comparison between a regional and semi-regional crustal OBS-model in the Vøring Basin, N. Norway, PAGEOPH, 149, 641–665, 1997b.

    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., P. Digranes, M. Van Schaack, H. Shimamura, H. Shiobara, S. Kodaira, O. Næess, N. Sørenes, and E. Vagnes, Crustal structure of the outer Vøring Plateau, offshore Norway, from ocean bottom seismic and gravity data, J. Geophys. Res., 106, 6769–6791, 2001.

    Article  Google Scholar 

  • Mjelde, R., J. P. Fjellanger, T. Raum, P. Digranes, S. Kodaira, A. Breivik, and H. Shimamura, Where do P-S converions occur? Analysis of OBS-data from the NE Atlantic Margin, First Break, 2002a (in press).

  • Mjelde, R., T. Raum, P. Digranes, H. Shimamura, H. Shiobara, and S. Kodaira, S-wave structure of the Vøring Margin, mid-Norway margin, from OBS-data, Tectonophys., 2002b (submitted).

  • Morgan, J. V, P. J. Barton, and R. S. White, The Hatton Bank continental margin, III, Structure from wide-angle OBS and multichannel seismic refraction profiles, Geophys. J. Int., 98, 367–384, 1989.

    Article  Google Scholar 

  • Mutter, J. C, M. Talwani, and P. L. Stoffa, Evidence for a thick oceanic crust adjacent to the Norwegian margin, J. Geophys. Res., 89, 483–502, 1984.

    Article  Google Scholar 

  • Mutter, J. C, W R. Buck, and C. M. Zehnder, Convective partial melting. 1. A model for the formation of thick basaltic sequences during the initiation of spreading, J. Geophys. Res., 93, 1031–1048, 1988.

    Article  Google Scholar 

  • Pickett, G. R., Acoustic character logs and their application in formation evaluation, J. Pet. Tech., 659–667, 1963.

  • Planke, S., J. Skogseid, and O. Eldholm, Crustal structure off Norway, 62–70°N, Tectonophys., 189, 91–107, 1991.

    Article  Google Scholar 

  • Raum, T., R. Mjelde, P. Digranes, H. Shimamura, H. Shiobara, S. Kodaira, G. Haatvedt, N. Sørenes, and T. Thorbjørnsen, Crustal structure of the southern part of the Vøring basin, mid-Norway margin, from wide-angle seismic and gravity data, Tectonophys., 2002 (in press).

  • Samson, C, P. J. Barton, and J. Karwatowski, Imaging beneath an opaque basaltic layer using densly sampled wide-angle OBS data, Geophys. Prosp., 43, 509–528, 1995.

    Article  Google Scholar 

  • Shimamura, H., OBS technical description, Annexe to cruise report, Sellevoll, 1988, Inst. of Solid Earth Physics, Univ. of Bergen, 52 pp., 1988.

  • Skogseid, J. and O. Eldholm, Vøring Plateau Continental Margin: Seismic interpretation, stratigraphy and vertical movements, in Proc. ODP, Sci. Results, 104, edited by O. Eldholm, J. Thiede, and J. Taylor, College Station, TX (Ocean Drilling Program), 1989.

  • Skogseid, J., T. Pedersen, O. Eldholm, and B. T. Larsen, Tectonism and Magmatism during NE Atlantic continental break-up: the Vøring margin, in Magmatism and the Causes of Continental Break-up, edited by B. C. Story, T. Alabaster, and R. J. Plankhurst, Geological Society Special Publications, 68, pp. 305–320, 1992.

  • Spencer, A. M. et al. (Eds.), Petroleum Geology of the North European Margin, pp. 436, London, Graham and Trotman, 1984.

  • Spencer, A. M. et al. (Eds.), Habitat of Hydrocarbons on the Norwegian continental shelf, Graham and Trotman, London, 1986.

  • Surlyk, F, S. Piasecki, F. Rolle, L. Stemmerik, E. Thomsen, and P. Wrang, The Permian basin of East Greenland, in Petroleum Geology of the North European Margin, edited by A. M. Spencer et al., pp. 303–315, Graham and Trotman, London, 1984.

    Chapter  Google Scholar 

  • Talwani, M., G. Udintsev, et al. (Eds.), Tectonic synthesis, in Initial reports Deep Sea Drilling Project. 38, Washington, D.C., U.S. Government Printing Office, pp. 1213–1242, 1976.

    Chapter  Google Scholar 

  • Tatham, R. H., Vp/Vs and lithology, Geophysics, 47, 336–344, 1982.

    Article  Google Scholar 

  • Tatham, R. H., Shear waves and lithology, in Seismic Shear Waves, Part B: Applications, edited by G. Dohr, pp. 86–133, Geophysical Press, London-Amsterdam, 1985.

    Google Scholar 

  • Tatham, R. H. and D. V. Goolsbee, Separation of S-wave and P-wave reflections offshore western Florida, Geophysics, 49, 493–508, 1984.

    Article  Google Scholar 

  • Tatham, R. H. and M. D. McCormack, Rock Physics Measurements, in Multicomponent Seismology in Petroleum Exploration, edited by E. B. Neitzel and D. F. Winterstein, SEG Investigation in Geophysics Series, 6, pp. 43–91, 1991.

  • Todd, B. J. and I. Reid, The continent-ocean boundary south of Flemish Cap: constraints from seismic refraction and gravity, Can. J. Earth Sci., 26, 1392–1407, 1989.

    Article  Google Scholar 

  • White, R. S. and R. A. Stephen, Compressional to shear wave conversion in oceanic crust, Geophys. J. R. astr. Soc., 63, 547–565, 1980.

    Article  Google Scholar 

  • Yamada, T., T. Asada, and H. Shimamura, A pop-up ocean bottom seismograph, Prog. Abst. Seism. Soc. Japan, 2, 126, 1981 (in Japanese).

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Digranes, P., Mjelde, R., Kodaira, S. et al. Regional and semi-regional modelling of wide-angle shear waves in OBS data from the Vøring Basin, N. Norway—a comparison. Earth Planet Sp 55, 65–81 (2003). https://doi.org/10.1186/BF03351734

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1186/BF03351734

Keywords

  • Shear Wave
  • Continental Crust
  • Lower Crust
  • Mode Conversion
  • Ocean Bottom