Use of mode-converted waves in marine seismic data to investigate the lithology of the sub-bottom sediments in Isfjorden,Svalbard |
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Authors: | Per Digranes Yngve Kristoffersen |
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Affiliation: | (1) Institute of Solid Earth Physics, University of Bergen, Allégt. 41, 5007 Bergen, Norway |
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Abstract: | 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 modellingVp/Vs ratios for part of the uppermost 5km of the crust are obtained. Low values (Vp/Vs=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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Keywords: | Mode-conversion marine/land geometry Vp/Vs ratios lithology |
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