Underwater seismology using submarine dark fibres
Magalhaes, R.; Fernández-Ruiz, M.R.; Costa, L.; Martins, H.F.; Garcia-Ruiz, A.; Martin-Lopez, S.; Williams, E.; Zhan, Z.; Vantilho, R.; Gonzalez-Herraezi, M. (2020). Underwater seismology using submarine dark fibres, in: 22nd International Conference on Transparent Optical Networks (ICTON). pp. 4. https://hdl.handle.net/10.1109/ICTON51198.2020.9203132
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| Author keywords |
Rayleigh scattering; optical time-domain reflectometry; underwater seismology; distributed sensing |
| Authors | | Top |
- Magalhaes, R.
- Fernández-Ruiz, M.R.
- Costa, L.
- Martins, H.F.
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- Garcia-Ruiz, A.
- Martin-Lopez, S.
- Williams, E.
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- Zhan, Z.
- Vantilho, R.
- Gonzalez-Herraezi, M.
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| Abstract |
We review our recent work on chirped-pulse distributed acoustic sensing (DAS) for the characterization of teleseismic and microseismic activity, particularly in submarine environments. We show that this tool may bring orders-of-magnitude more seismic data from the sea bottom, that could lead to a new understanding of the deep Earth's interior. We show the detection of an M8.2 earthquake occurred in the Fiji Islands in August 2018, using an ocean-bottom DAS array located >16000 km away from the earthquake. The acquired signals are compared with the spectrogram of a nearby broadband seismic station, showing major similar features between the two records. The results show the great potential of re-using already-deployed telecommunication fibre network for distributed teleseism monitoring. |
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