Seismic and environmental observations from a North Atlantic seafloor sensor array created from a trans-oceanic submarine cable
Optical interferometry can be used to measure the propagation time of the light along fibre optic cables, enabling the detection of environmental perturbations such as earthquake waves as they interact with the fibre [Marra et al., 2018]. However, at any point in time, the measured signal is an inte...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5021798 2023-07-30T04:05:29+02:00 Seismic and environmental observations from a North Atlantic seafloor sensor array created from a trans-oceanic submarine cable Marra, G. Fairweather, D. Kamalov, V. Gaynor, P. Cantono, M. Mulholland, S. Baptie, B. Castellanos, J. Vagenas, G. Gaudron, J. Kronjäger, J. Hill, I. Schioppo, M. Barbeito Edreira, I. Burrows, K. Clivati, C. Calonico, D. Curtis, A. 2023-07-11 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021798 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-4366 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021798 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-4366 2023-07-16T23:40:28Z Optical interferometry can be used to measure the propagation time of the light along fibre optic cables, enabling the detection of environmental perturbations such as earthquake waves as they interact with the fibre [Marra et al., 2018]. However, at any point in time, the measured signal is an integration of the optical path length changes along the entire fibre. This can result in a high measurement noise floor since the ambient noise along the entire length of the seafloor cable is integrated. Over the lengths of thousands of kilometres of transoceanic seafloor cables, this can prevent the detection of smaller magnitude events.We present a novel technique that allows many discrete spans along a single fibre optic cable to be used as individual ocean bottom seismometers. These spans are tens of kilometres long and this reduction in length of each line-receiver allows us to monitor specific locations along the cable path. From an observation window of four months, we show that earthquakes, tides, wave heights and ocean microseisms can all be recorded on individual spans between repeaters on a 5,860 km-long transatlantic cable, in addition to monitoring along the whole cable length.On the continental shelf we observe strong correlations between periodic signals at different frequencies with tides, wave heights and microseisms. In the comparatively quieter deep ocean we have detected two teleseismic earthquakes greater than M w 7. Other enigmatic signals related to ocean tides and the solid Earth’s microseisms are also evident. Conference Object North Atlantic GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
Optical interferometry can be used to measure the propagation time of the light along fibre optic cables, enabling the detection of environmental perturbations such as earthquake waves as they interact with the fibre [Marra et al., 2018]. However, at any point in time, the measured signal is an integration of the optical path length changes along the entire fibre. This can result in a high measurement noise floor since the ambient noise along the entire length of the seafloor cable is integrated. Over the lengths of thousands of kilometres of transoceanic seafloor cables, this can prevent the detection of smaller magnitude events.We present a novel technique that allows many discrete spans along a single fibre optic cable to be used as individual ocean bottom seismometers. These spans are tens of kilometres long and this reduction in length of each line-receiver allows us to monitor specific locations along the cable path. From an observation window of four months, we show that earthquakes, tides, wave heights and ocean microseisms can all be recorded on individual spans between repeaters on a 5,860 km-long transatlantic cable, in addition to monitoring along the whole cable length.On the continental shelf we observe strong correlations between periodic signals at different frequencies with tides, wave heights and microseisms. In the comparatively quieter deep ocean we have detected two teleseismic earthquakes greater than M w 7. Other enigmatic signals related to ocean tides and the solid Earth’s microseisms are also evident. |
format |
Conference Object |
author |
Marra, G. Fairweather, D. Kamalov, V. Gaynor, P. Cantono, M. Mulholland, S. Baptie, B. Castellanos, J. Vagenas, G. Gaudron, J. Kronjäger, J. Hill, I. Schioppo, M. Barbeito Edreira, I. Burrows, K. Clivati, C. Calonico, D. Curtis, A. |
spellingShingle |
Marra, G. Fairweather, D. Kamalov, V. Gaynor, P. Cantono, M. Mulholland, S. Baptie, B. Castellanos, J. Vagenas, G. Gaudron, J. Kronjäger, J. Hill, I. Schioppo, M. Barbeito Edreira, I. Burrows, K. Clivati, C. Calonico, D. Curtis, A. Seismic and environmental observations from a North Atlantic seafloor sensor array created from a trans-oceanic submarine cable |
author_facet |
Marra, G. Fairweather, D. Kamalov, V. Gaynor, P. Cantono, M. Mulholland, S. Baptie, B. Castellanos, J. Vagenas, G. Gaudron, J. Kronjäger, J. Hill, I. Schioppo, M. Barbeito Edreira, I. Burrows, K. Clivati, C. Calonico, D. Curtis, A. |
author_sort |
Marra, G. |
title |
Seismic and environmental observations from a North Atlantic seafloor sensor array created from a trans-oceanic submarine cable |
title_short |
Seismic and environmental observations from a North Atlantic seafloor sensor array created from a trans-oceanic submarine cable |
title_full |
Seismic and environmental observations from a North Atlantic seafloor sensor array created from a trans-oceanic submarine cable |
title_fullStr |
Seismic and environmental observations from a North Atlantic seafloor sensor array created from a trans-oceanic submarine cable |
title_full_unstemmed |
Seismic and environmental observations from a North Atlantic seafloor sensor array created from a trans-oceanic submarine cable |
title_sort |
seismic and environmental observations from a north atlantic seafloor sensor array created from a trans-oceanic submarine cable |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021798 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-4366 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021798 |
op_doi |
https://doi.org/10.57757/IUGG23-4366 |
_version_ |
1772817443291398144 |