Fiber Optic Sensing in the Arctic Utilizing DAS (Distributed Acoustic Sensing) Technology

Robin André Rørstadbotnen
TrackTrack 2
DescriptionDistributed acoustic sensing (DAS) has received growing attention in the last decade. This technology ‘re-purposes’ a dark fibre optic cable into a dense receiver array that might stretch up to 150 km with a spatial sampling interval down to 1 meter. In the Center for Geophysical Forecasting, a new research centre for research-based innovation at NTNU, analysis of such DAS data has a central role in the ongoing research. Two long-term (40 days or more) acquisitions using a subsea and an onshore fibres have been carried out, and results from these will be presented here. The first acquisition was executed using a 120 km portion of a 250 km Arctic subsea fibre optic cable connecting Longyearbyen to Ny-Ålesund, Svalbard, in order to sense the different acoustic signals in the area. Various results of this ongoing work will be shown, including whale detection and localization, ship tracking, and storm and earthquake signatures. An onshore acquisition was carried out in a quick clay area north of Trondheim in Rissa. This work aims to investigate various techniques for efficient quick-clay monitoring.

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