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Integrated geophysics for mapping of soil depth and rock properties in water passages

Reference number
Coordinator Lunds universitet - Teknisk geologi
Funding from Vinnova SEK 898 280
Project duration June 2018 - September 2020
Status Completed
Venture The strategic innovation program InfraSweden

Purpose and goal

This is a feasibility study of how fiber optic cable as an acoustic sensor can be applied in engineering geological seismic surveys. The project has compared a fiber optic seismic system from Silixa, Carina, with hydrophones. In addition, geoelectric measurements was performed to create a complete geophysical dataset for further analysis and to obtain reference data to verify seismic results. We conclude that fiber optic cable placed on the seabed without further coupling than its own weight can be a very good sensor for measuring refraction waves.

Expected effects and result

Fiber optic cable placed on the seabed without additional coupling than its own weight seems to be a very good sensor for measuring refraction waves. Due to the type of fiber cable used in this study, velocity below 3000 m/s have not been possible to study, therefore it cannot be concluded that it can also measure direct waves in water or soil. Based on the results, it looks like optical fiber may in the future be a powerful tool for seismic measurements for integrated geophysical surveys in infrastructure projects.

Planned approach and implementation

The project was carried out as a practical field study where fiber optic cable was tested together with conventional equipment under the same conditions that prevail in real life investigations for infrastructure projects. As optical fiber systems are new technology under constant development, they are linked to high costs, and because of this it was only possible to carry out a full-scale field trial. Parts of the results are very promising, but further attempts would be needed to verify all the set goals.

The project description has been provided by the project members themselves and the text has not been looked at by our editors.

Last updated 10 October 2020

Reference number 2018-00643

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