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Related Experiment Video

Updated: Sep 20, 2025

Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
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Distributed acoustic sensing for active offshore shear wave profiling.

Andrew Trafford1,2, Robert Ellwood3, Loris Wacquier1,2

  • 1School of Civil Engineering, University College Dublin, Dublin, Ireland.

Scientific Reports
|June 11, 2022
PubMed
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Distributed acoustic sensing (DAS) offers a novel, cost-effective method for offshore geotechnical assessments. This technology rapidly determines shear wave velocity profiles, reducing design uncertainty for offshore wind farms.

Area of Science:

  • Geophysics and Geotechnical Engineering
  • Offshore Renewable Energy
  • Seismic Exploration

Background:

  • The offshore wind industry needs efficient geotechnical methods for cost-effective design.
  • Current methods can be conservative and expensive.
  • Accurate shallow subsurface assessment is crucial for offshore construction.

Purpose of the Study:

  • To introduce and evaluate distributed acoustic sensing (DAS) for geophysical and geotechnical site characterization.
  • To assess the effectiveness of DAS in determining shear wave velocity profiles for offshore wind farm development.
  • To compare DAS with traditional methods for shallow subsurface investigation.

Main Methods:

  • Utilized distributed acoustic sensing (DAS) to acquire active Scholte-wave seismic data.

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Last Updated: Sep 20, 2025

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  • Employed a CST armoured fibre optic cable for data acquisition in the offshore environment.
  • Integrated DAS data with high-resolution sparker seismic reflection, cone penetration tests (CPT), and gravity coring.
  • Investigated the use of a gravity corer as a seismic source for Scholte-wave acquisition.

    • Main Results:

    • DAS effectively acquired seismic data for shallow subsurface assessment.
    • The gravity corer as a seismic source provided better resolution of fundamental mode Scholte-waves than an airgun.
    • DAS rapidly determined shear wave velocity profiles across diverse geological contexts.
    • Achieved metre-scale spatial sampling over multi-kilometre distances.

    Conclusions:

    • Distributed acoustic sensing (DAS) provides a viable and efficient approach for offshore geotechnical investigations.
    • This integrated DAS method can significantly reduce design uncertainty in offshore construction projects.
    • The application of DAS has the potential to lower the levelised cost of offshore wind power generation.