Shear-wave splitting in shallow clays observed in a multi-offset and walk-around VSP

  • Jan Douma Rijksuniversiteit Utrecht, Department of Exploration Geophysics, Institute for Earth Sciences, P. 0. Box 80.021, 3508 TA Utrecht, The Netherlands
  • Klaus Helbig Rijksuniversiteit Utrecht, Department of Exploration Geophysics, Institute for Earth Sciences, P. 0. Box 80.021, 3508 TA Utrecht, The Netherlands
  • Floris Schokking Geological Survey of The Netherlands, Spaarne 17, 2011 CD Haar/em, The Netherlands
  • Johan Tempels Rijksuniversiteit Utrecht, Department of Exploration Geophysics, Institute for Earth Sciences, P. 0. Box 80.021, 3508 TA Utrecht, The Netherlands
Keywords: Pot Clay, fractures, anisotropy, polarization, VSP, penetration cone

Abstract

Vertical seismic profiling using shear waves showed seismic anisotropy in the shallow 'Pot-Clay' sequence in the northern parts of The Netherlands. Shear-wave splitting, a key identifier for anisotropy, was observed at various depth using a multi-offset/multi-azimuth data acquisition technique. For the first time in such investigations, a three-component geophone mounted in a penetration cone was used. This technique resulted in improved data quality. A hodogram analysis of the shear wave data showed that fissures with strike and dip as specified by geological and geotechnical data cannot explain all observations of shear-wave splitting.

Published
1990-01-01
How to Cite
Jan Douma, Klaus Helbig, Floris Schokking, & Johan Tempels. (1990). Shear-wave splitting in shallow clays observed in a multi-offset and walk-around VSP. Netherlands Journal of Geosciences, 417-428. Retrieved from https://njgjournal.nl/index.php/njg/article/view/12881
Issue
Volume 69 - 1990
Section
Regular paper

Authors contributing to Netherlands Journal of Geosciences retain copyright of their work, with first publication rights granted to the Netherlands
Journal of Geosciences Foundation. Read the journal's full Copyright- and Licensing Policy.