Abstracts
The compression wavefield is efficiently converted to shear-wave energy at post-critical angles in areas of high impedance contrast at the sea floor. We have analysed mode-converted shear waves in a data set acquired with a hybrid marine/land geometry in Isfjorden, Svalbard. Through a kinematic 2D ray-tracing modellingV p/Vs ratios for part of the uppermost 5km of the crust are obtained. Low values (V p /V s =1.65) are tentatively associated with the section of Devonian sandstones which appears to attain a minimum thickness of 1.5km below 3 km depth about 10km west of Kapp Thorden.
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Bergh, S. G., Andresen, A., andBraathen, A. (1995),Polyphase Interaction of Basement-involved and Thin-skinned Deformation; Tertiary Fold and Thrust Belt, Oscar II Land, Spitsbergen, Tectonics, in press.
Domenico, S. N. (1984),Rock Lithology and Porosity Determination from Shear and Compressional Wave Velocity, Geophys.49, 1188–1195.
Eiken, O., andAustegaard, A. (1987),The Tertiary Orogenic Belt of West Spitsbergen: Seismic Expressions of the Offshore Sedimentary Basins, Norsk Geologisk Tidsskrift67, 383–394.
Elverhøi, A., andGrønlie, G. (1981),Diagenetic and Sedimentological Explanation for High Seismic Velocity and Low Porosity in Mesozoic-Tertiary Sediments, Svalbard Region, Am. Assoc. Petrol. Geologists, Bulletin65, 145–163.
Flood, B., Nagy, J., andWinsnes, T. S. (1971),Geological map Svalbard 1: 500.000. Sheet 3G Spitsbergen Northern Part, InNorsk Polarinstitutt Skrifter, 154 E.
Grønlie, G., Elverhøi, A., andKristoffersen, Y. (1980),A Seismic Velocity Inversion on Bjørnøya—the Western Barents Shelf, Marine Geology35, 17–26.
Kim, N. W., andSheriff, A. J. (1992),Marine PSSP Reflections with a Bottom Velocity Transition Zone, Geophys.57, 161–170.
Kurinen, R. G.,Density and magnetic susceptibility of Vestspitsbergen rocks. InGeology of Spitsbergen 2. Translated into English 1970 (National Lending Library for Science and Technology, Yorkshire, England 1965) pp. 284–286.
Nøttvedt, A., Eiken, O., andMidbøe, P. S.,Knipovich Ridge-Isfjorden-Adventdalen-Sassendalen-Sabine Land. InSeismic Atlas of Western Svalbard. A Selection of Regional Seismic Transects (Eiken, O., ed.) (Norsk Polarinstitutt Meddelelser 130 1994) pp. 19–22.
Pickett, G. R. (1963),Acoustic Character Logs and their Application in Formation Evaluation, J. Petrol. Tech. 659–667.
Scola, I. V., Pcelina, T. M., Mazur, V. B., andAlter, S. M.,New data on the composition and structure of the sedimentary platform cover (jacket) on the basis of materials from the drilling of a parametric hole at Grumantbyen. InGeology of the Sedimentary Platform Cover (jacket) of the Archipelago of Svalbard. Collection of scientific papers (NIIGA, Leningrad 1980) pp. 13–24.
Steel, R. J., andWorsley, D.,Svalbard's Post Caledonian strata: An atlas of sedimentational patterns and paleogeographic evolution. InPetroleum Geology of the North European Margin (Spencer, A. M.et al., eds.) (Grahara and Trotman for the Norwegian Petroleum Society 1984) pp. 109–136.
Tatham, R. H. (1982),V p /V s and Lithology, Geophys.47, 336–344.
Tatham, R. H., andStoffa, P. L. (1976),V p /V s —A Potential Hydrocarbon Indicator, Geophys.41, 837–849.
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Digranes, P., Kristoffersen, Y. Use of mode-converted waves in marine seismic data to investigate the lithology of the sub-bottom sediments in Isfjorden, Svalbard. PAGEOPH 145, 313–325 (1995). https://doi.org/10.1007/BF00880273
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DOI: https://doi.org/10.1007/BF00880273