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Ocean-Bottom Laser Seismograph.

Grigory Dolgikh1, Stanislav Dolgikh1, Aleksandr Plotnikov1

  • 1V.I. Il'ichev Pacific Oceanological Institute FEB RAS, 690041 Vladivostok, Russia.

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A new ocean-bottom laser seismograph accurately measures seabed displacements. This innovative instrument effectively records vertical movements caused by waves and seiches, demonstrating high efficiency in geophysical research.

Keywords:
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Area of Science:

  • Geophysics
  • Oceanography
  • Seismology

Background:

  • Seabed displacement monitoring is crucial for understanding geophysical processes.
  • Existing methods may have limitations in low-frequency detection.

Purpose of the Study:

  • To introduce and evaluate a novel ocean-bottom laser seismograph.
  • To measure vertical seabed displacements in sonic and infrasonic ranges.

Main Methods:

  • Utilized a modified laser meter for hydrosphere pressure variations.
  • Designed to record vertical bottom displacements with nanometer accuracy.
  • Tested in the frequency range from 0 to 1000 Hz.

Main Results:

  • Successfully registered vertical seabed displacements from sea wind waves.
  • Detected lower frequency processes like seiches (eigenoscillations).
  • Demonstrated good efficiency through comparison with pressure and velocity meters.

Conclusions:

  • The ocean-bottom laser seismograph is an effective tool for geophysical monitoring.
  • The instrument shows potential for improved measurements with advanced lasers.
  • Validates the utility of laser-based seismography for seabed studies.