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Seafloor sound-speed profile and interface dip angle characterization by the image source method.

S Pinson1, C W Holland1

  • 1Applied Research Laboratory, The Pennsylvania State University, State College, Pennsylvania 16804.

The Journal of the Acoustical Society of America
|August 7, 2014
PubMed
Summary
This summary is machine-generated.

This study enhances seafloor characterization using sound-speed tomography by accounting for angled seafloor layers. The improved method offers more accurate sub-seafloor structure analysis.

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Area of Science:

  • Geophysics
  • Oceanography
  • Acoustic methods

Background:

  • The image source method is efficient for seafloor sound-speed tomography.
  • Current limitations include a range-independent approximation for flat seafloor layers.

Purpose of the Study:

  • To extend the image source method to handle realistic variations in seafloor interface dip angles.
  • To improve the accuracy of seafloor characterization in complex geological settings.

Main Methods:

  • Utilized an elliptical wavefront shape approximation for reflected waves.
  • Developed a simplified equation relating travel time to dip angle and equivalent medium sound speed.
  • Employed the Radon transform to extract interface dip angles.

Main Results:

  • Successfully extended the image source method to incorporate variable interface dip angles.
  • The new approach provides a more accurate estimation of sound speed in complex seafloor structures.
  • Simulations demonstrated the method's capabilities and limitations with varying dip angles and curvature.

Conclusions:

  • The extended image source method overcomes previous limitations, enabling more robust seafloor characterization.
  • This advancement allows for detailed analysis of sub-seafloor structures with dipping interfaces.
  • The method shows promise for applications in marine geology and resource exploration.