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Efficient Sampling of Geophysical Sensor Arrays on the Seafloor.

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Title: Efficient Sampling of Geophysical Sensor Arrays on the Seafloor.
Authors: Zumberge, M. A.1 mzumberge@ucsd.edu, Horwitt, D.1
Source: Perspectives of Earth & Space Scientists. Dec2025, Vol. 6 Issue 1, p1-6. 6p.
Subject Terms: *Geophysical instruments, *Ocean bottom, *Time division multiple access, *Optical sensors, *Geodesy
Abstract: The great expense of deploying dense arrays of seafloor sensors for continuous collection of geophysical data inhibits the proliferation of measurement systems to the majority of the planet's surface. Advancing geophysical coverage offshore will require technologies different from conventional methods applied onshore where electrical power and communication infrastructure is ubiquitous. Optics‐based sensors offer an approach that is efficient and scalable. Many sensors connected to a single, long optical fiber cable can be multiplexed to one electro‐optic system at the cable's end. A 100‐km long optical cable is less expensive and superior to an electrical cable of the same length as long as the required sensors can operate with light rather than electronics. We show that Time Division Multiplexing (TDM) of optical sensors can provide a low‐cost, power efficient, scalable infrastructure for arrays of both seismic and geodetic sensors on the seafloor. Plain Language Summary: Most (70%) of the Earth is underwater. Satellite signals cannot penetrate seawater, and the cost of running cables to offshore sensors is prohibitively high. We demonstrate a method for using an optical fiber cable to connect many sensors (seismometers, e.g.) to a single, low‐power system that can operate on batteries, enabling the establishment of geophysical arrays far offshore. Key Points: Many geophysical sensors for seismology and geodesy can rely on opticsAn efficient, low cost, optics‐based array of sensors on the seafloor can be created using Time Division Multiplexing [ABSTRACT FROM AUTHOR]
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  Data: Efficient Sampling of Geophysical Sensor Arrays on the Seafloor.
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  Data: *<searchLink fieldCode="DE" term="%22Geophysical+instruments%22">Geophysical instruments</searchLink><br />*<searchLink fieldCode="DE" term="%22Ocean+bottom%22">Ocean bottom</searchLink><br />*<searchLink fieldCode="DE" term="%22Time+division+multiple+access%22">Time division multiple access</searchLink><br />*<searchLink fieldCode="DE" term="%22Optical+sensors%22">Optical sensors</searchLink><br />*<searchLink fieldCode="DE" term="%22Geodesy%22">Geodesy</searchLink>
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  Data: The great expense of deploying dense arrays of seafloor sensors for continuous collection of geophysical data inhibits the proliferation of measurement systems to the majority of the planet's surface. Advancing geophysical coverage offshore will require technologies different from conventional methods applied onshore where electrical power and communication infrastructure is ubiquitous. Optics‐based sensors offer an approach that is efficient and scalable. Many sensors connected to a single, long optical fiber cable can be multiplexed to one electro‐optic system at the cable's end. A 100‐km long optical cable is less expensive and superior to an electrical cable of the same length as long as the required sensors can operate with light rather than electronics. We show that Time Division Multiplexing (TDM) of optical sensors can provide a low‐cost, power efficient, scalable infrastructure for arrays of both seismic and geodetic sensors on the seafloor. Plain Language Summary: Most (70%) of the Earth is underwater. Satellite signals cannot penetrate seawater, and the cost of running cables to offshore sensors is prohibitively high. We demonstrate a method for using an optical fiber cable to connect many sensors (seismometers, e.g.) to a single, low‐power system that can operate on batteries, enabling the establishment of geophysical arrays far offshore. Key Points: Many geophysical sensors for seismology and geodesy can rely on opticsAn efficient, low cost, optics‐based array of sensors on the seafloor can be created using Time Division Multiplexing [ABSTRACT FROM AUTHOR]
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      – Type: doi
        Value: 10.1029/2025CN000288
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      – Code: eng
        Text: English
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        PageCount: 6
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      – SubjectFull: Geophysical instruments
        Type: general
      – SubjectFull: Ocean bottom
        Type: general
      – SubjectFull: Time division multiple access
        Type: general
      – SubjectFull: Optical sensors
        Type: general
      – SubjectFull: Geodesy
        Type: general
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      – TitleFull: Efficient Sampling of Geophysical Sensor Arrays on the Seafloor.
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              M: 12
              Text: Dec2025
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              Y: 2025
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