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Optical interferometry-based array of seafloor environmental sensors using a transoceanic submarine cable.

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This study uses existing undersea communication cables to detect earthquakes and ocean signals on individual cable spans. This breakthrough enables real-time seafloor monitoring without altering vital subsea infrastructure.

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Area of Science:

  • Geophysics
  • Oceanography
  • Fiber Optic Sensing

Background:

  • Existing undersea fiber optic communication cables offer vast potential for Earth observation.
  • Previous sensing methods were limited to integrated measurements over entire cable lengths.
  • The deep ocean floor remains largely unmonitored by permanent, real-time sensors.

Purpose of the Study:

  • To demonstrate localized environmental sensing using existing submarine communication cable infrastructure.
  • To detect seismic and oceanic events on individual spans between cable repeaters.
  • To enable widespread, real-time seafloor monitoring without infrastructure modification.

Main Methods:

  • Utilized optical fiber-based sensing technology.
  • Applied techniques to a 5860-kilometer transatlantic communication cable.
  • Focused on detecting signals within individual repeater spans (45-90 km).

Main Results:

  • Successfully detected earthquakes and ocean signals on individual cable spans.
  • Demonstrated sensing capabilities over specific segments, not just the entire cable length.
  • Validated the feasibility of using existing infrastructure for localized measurements.

Conclusions:

  • Optical fiber sensing can be applied to existing submarine cables for localized seafloor event detection.
  • This method allows for the creation of a dense network of real-time ocean sensors.
  • The approach requires no modifications to the existing undersea communication network, offering a cost-effective solution for ocean monitoring.