Use of mode-converted waves in marine seismic data to investigate the lithology of the sub-bottom sediments in Isfjorden, Svalbard

Autor: Yngve Kristoffersen, Per Digranes
Rok vydání: 1995
Předmět:
Zdroj: Pure and Applied Geophysics PAGEOPH. 145:313-325
ISSN: 1420-9136
0033-4553
DOI: 10.1007/bf00880273
Popis: 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.
Databáze: OpenAIRE
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