EGU24-9254, updated on 08 Mar 2024
https://doi.org/10.5194/egusphere-egu24-9254
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Locating mine explosions in shallow waters from hydroacoustic waves using DAS

Emil Fønss Jensen1, Jonas F. Damsgård2, Peter H. Voss1, Thomas Funck1, and Thomas Mejer Hansen2
Emil Fønss Jensen et al.
  • 1Geological Survey of Denmark and Greenland, Department of Geophysics and Sedimentary Basins, Copenhagen, Denmark (efj@geus.dk)
  • 2Aarhus University, Department of Geoscience, Aarhus, Denmark

Of the roughly 50.000 mines that were deployed in Danish waters during the First and Second World Wars, the Royal Danish Navy estimates that 4.000 to 6.000 units remain unexploded. Naval mines are to this day regularly found by fishermen or during surveys related to offshore construction work and reported to the Royal Danish Navy who then undertakes their controlled detonation. Seismic and hydroacoustic signals from naval mine explosions have been recorded by distributed acoustic sensing (DAS) on subsea fiber optic cabling where the hydroacoustic waves are readily identified. We have developed a simple technique that uses inversion of the travel time of hydroacoustic signals to determine the location of explosions. The technique has also been tested on hydroacoustic waves from a marine air gun seismic survey that crosses a fiber cable in shallow water monitored by DAS. We present the inversion results in addition to the data processing and analysis.

How to cite: Jensen, E. F., Damsgård, J. F., Voss, P. H., Funck, T., and Hansen, T. M.: Locating mine explosions in shallow waters from hydroacoustic waves using DAS, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-9254, https://doi.org/10.5194/egusphere-egu24-9254, 2024.