Time-lapse seismic imaging has improved our capability to measure and understand dynamic processes in the subsurface. However, there are very few examples using ultra-high-frequency (kHz-range) seismic data. Exacting requirements for navigation can be prohibitive for acquiring coherent, true-3D volumes and residual errors manifest as noise in time-lapse differences making it challenging to interpret real subsurface changes.

By updating the acquisition and processing workflows for the 3D Chirp, an ultra-high-frequency sub-bottom profiler, initial results illustrate high amplitude and navigation repeatability. Post-processing was used to improve the capability and performance of real-time kinematic GPS, coupled with high-accuracy inertial measurements to yield centimetre-level absolute positioning in a range of operating conditions. A comparison of seismic reflection volumes acquired over the same area at high and low tide reveals a normalized RMS difference of 16.1% and demonstrates the capability for direct quantitative monitoring of the shallow subsurface at decimeter-resolution.


Article metrics loading...

Loading full text...

Full text loading...


  1. Cevatoglu, M., Bull, J.M., Vardy, M.E., Gernon, T.M., Wright, I.C. and Long, D.
    [2015] Gas migration pathways, controlling mechanisms and changes in sediment acoustic properties observed in a controlled sub-seabed CO2 release experiment. International Journal of Greenhouse Gas Control, 38,26–43.
    [Google Scholar]
  2. Dix, J., Hamilton, R., Faggetter, M.J., Fry, C.R., Malgorn, J., Pinson, L.J.W., Vardy, M.E. and Dewing-Andrews, E.
    [2016] True 3D High Resolution Imaging for Pre-and Post-Installation of Offshore Infrastructures. Near Surface Geoscience 2016 - Second Applied Shallow Marine Geophysics Conference.
    [Google Scholar]
  3. Mueller, C., Woelz, S. and Kalmring, S.
    [2013] High-Resolution 3D Marine Seismic Investigation of Hedeby Harbour, Germany. International Journal of Nautical Archaeology, 42(2), 326–336.
    [Google Scholar]
  4. Vardy, M.E. & Henstock, T.J.
    [2010] A frequency-approximated approach to Kirchhoff migration. Geophysics, 75(6), 211–218.
    [Google Scholar]

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error