Utilizing distributed acoustic sensing and ocean bottom fiber optic cables for submarine structural characterization

Abstract The sparsity of permanent seismic instrumentation in marine environments often limits the availability of subsea information on geohazards, including active fault systems, in both time and space. One sensing resource that provides observational access to the seafloor environment are existin...

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Autores principales:	Feng Cheng, Benxin Chi, Nathaniel J. Lindsey, T. Craig Dawe, Jonathan B. Ajo-Franklin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a9c8fb556b2341f9a24e146d488d271b
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spelling	oai:doaj.org-article:a9c8fb556b2341f9a24e146d488d271b2021-12-02T15:53:42ZUtilizing distributed acoustic sensing and ocean bottom fiber optic cables for submarine structural characterization10.1038/s41598-021-84845-y2045-2322https://doaj.org/article/a9c8fb556b2341f9a24e146d488d271b2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84845-yhttps://doaj.org/toc/2045-2322Abstract The sparsity of permanent seismic instrumentation in marine environments often limits the availability of subsea information on geohazards, including active fault systems, in both time and space. One sensing resource that provides observational access to the seafloor environment are existing networks of ocean bottom fiber optic cables; these cables, coupled to modern distributed acoustic sensing (DAS) systems, can provide dense arrays of broadband seismic observations capable of recording both seismic events and the ambient noise wavefield. Here, we report a marine DAS application which demonstrates the strength and limitation of this new technique on submarine structural characterization. Based on ambient noise DAS records on a 20 km section of a fiber optic cable offshore of Moss Landing, CA, in Monterey Bay, we extract Scholte waves from DAS ambient noise records using interferometry techniques and invert the resulting multimodal dispersion curves to recover a high resolution 2D shear-wave velocity image of the near seafloor sediments. We show for the first time that the migration of coherently scattered Scholte waves observed on DAS records can provide an approach for resolving sharp lateral contrasts in subsurface properties, particularly shallow faults and depositional features near the seafloor. Our results provide improved constraints on shallow submarine features in Monterey Bay, including fault zones and paleo-channel deposits, thus highlighting one of many possible geophysical uses of the marine cable network.Feng ChengBenxin ChiNathaniel J. LindseyT. Craig DaweJonathan B. Ajo-FranklinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Feng Cheng Benxin Chi Nathaniel J. Lindsey T. Craig Dawe Jonathan B. Ajo-Franklin Utilizing distributed acoustic sensing and ocean bottom fiber optic cables for submarine structural characterization
description	Abstract The sparsity of permanent seismic instrumentation in marine environments often limits the availability of subsea information on geohazards, including active fault systems, in both time and space. One sensing resource that provides observational access to the seafloor environment are existing networks of ocean bottom fiber optic cables; these cables, coupled to modern distributed acoustic sensing (DAS) systems, can provide dense arrays of broadband seismic observations capable of recording both seismic events and the ambient noise wavefield. Here, we report a marine DAS application which demonstrates the strength and limitation of this new technique on submarine structural characterization. Based on ambient noise DAS records on a 20 km section of a fiber optic cable offshore of Moss Landing, CA, in Monterey Bay, we extract Scholte waves from DAS ambient noise records using interferometry techniques and invert the resulting multimodal dispersion curves to recover a high resolution 2D shear-wave velocity image of the near seafloor sediments. We show for the first time that the migration of coherently scattered Scholte waves observed on DAS records can provide an approach for resolving sharp lateral contrasts in subsurface properties, particularly shallow faults and depositional features near the seafloor. Our results provide improved constraints on shallow submarine features in Monterey Bay, including fault zones and paleo-channel deposits, thus highlighting one of many possible geophysical uses of the marine cable network.
format	article
author	Feng Cheng Benxin Chi Nathaniel J. Lindsey T. Craig Dawe Jonathan B. Ajo-Franklin
author_facet	Feng Cheng Benxin Chi Nathaniel J. Lindsey T. Craig Dawe Jonathan B. Ajo-Franklin
author_sort	Feng Cheng
title	Utilizing distributed acoustic sensing and ocean bottom fiber optic cables for submarine structural characterization
title_short	Utilizing distributed acoustic sensing and ocean bottom fiber optic cables for submarine structural characterization
title_full	Utilizing distributed acoustic sensing and ocean bottom fiber optic cables for submarine structural characterization
title_fullStr	Utilizing distributed acoustic sensing and ocean bottom fiber optic cables for submarine structural characterization
title_full_unstemmed	Utilizing distributed acoustic sensing and ocean bottom fiber optic cables for submarine structural characterization
title_sort	utilizing distributed acoustic sensing and ocean bottom fiber optic cables for submarine structural characterization
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a9c8fb556b2341f9a24e146d488d271b
work_keys_str_mv	AT fengcheng utilizingdistributedacousticsensingandoceanbottomfiberopticcablesforsubmarinestructuralcharacterization AT benxinchi utilizingdistributedacousticsensingandoceanbottomfiberopticcablesforsubmarinestructuralcharacterization AT nathanieljlindsey utilizingdistributedacousticsensingandoceanbottomfiberopticcablesforsubmarinestructuralcharacterization AT tcraigdawe utilizingdistributedacousticsensingandoceanbottomfiberopticcablesforsubmarinestructuralcharacterization AT jonathanbajofranklin utilizingdistributedacousticsensingandoceanbottomfiberopticcablesforsubmarinestructuralcharacterization
_version_	1718385529288916992

Utilizing distributed acoustic sensing and ocean bottom fiber optic cables for submarine structural characterization

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