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Compressive geoacoustic inversion using ambient noise.

Caglar Yardim1, Peter Gerstoft1, William S Hodgkiss1

  • 1Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238.

The Journal of the Acoustical Society of America
|March 11, 2014
PubMed
Summary
This summary is machine-generated.

Ambient noise recorded by drifting arrays can reveal seafloor sediment properties. This passive geoacoustic inversion method uses beamforming and compressive sensing to accurately determine sediment layer details.

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Area of Science:

  • Geophysics
  • Oceanography
  • Acoustics

Background:

  • Surface-generated ambient noise offers a passive source for geophysical surveys.
  • Understanding seafloor sediment properties is crucial for various oceanographic applications.

Purpose of the Study:

  • To develop and demonstrate a passive geoacoustic inversion method using ambient noise.
  • To infer seafloor sediment properties, including layer interfaces, thickness, sound speed, density, and attenuation.

Main Methods:

  • Utilizing noise recorded by a drifting vertical array.
  • Employing beamforming to analyze noise directionality.
  • Applying coherent (minimum variance distortionless response fathometer) and incoherent (conventional beamformer) methods.
  • Integrating compressive sensing for interface inversion and refinement of sediment parameters.

Main Results:

  • Successfully inferred sediment properties from ambient noise data.
  • Compressive sensing enabled automatic determination of sediment layer interfaces.
  • Combined methods refined estimates of sediment thickness, sound speed, density, and attenuation.

Conclusions:

  • Passive geoacoustic inversion using ambient noise is a viable method for characterizing seafloor sediments.
  • The integration of compressive sensing enhances the accuracy and automation of sediment property estimation.
  • The demonstrated method is effective even with data from drifting arrays, as shown in the Boundary 2003 experiment.