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Seabed roughness parameters from joint backscatter and reflection inversion at the Malta Plateau.

Gavin Steininger¹, Charles W Holland, Stan E Dosso

¹School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 3P6, Canada. gsteinin@uvic.ca

The Journal of the Acoustical Society of America

|August 24, 2013

Summary

This study estimates seabed roughness and geoacoustic properties on the Malta Plateau using Bayesian inversion. Results reveal a multi-layer sediment profile over an elastic basement, aligning with geological knowledge.

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Area of Science:

Marine geophysics
Acoustic oceanography
Geophysical inversion

Background:

Understanding seabed properties is crucial for marine operations and geological surveys.
Accurate geoacoustic models are essential for interpreting acoustic data.

Purpose of the Study:

To estimate seabed roughness and geoacoustic parameters on the Malta Plateau.
To quantify uncertainties in these estimations using joint Bayesian inversion.

Main Methods:

Joint Bayesian inversion of mono-static backscatter and reflection coefficient data.
Modeling sediment layers over an elastic basement with a von Karman roughness spectrum.
Utilizing interacting Markov chains and trans-dimensional sampling for parameter estimation.

Main Results:

Well-defined scattering (roughness) parameters were obtained, consistent with prior measurements.
A multi-layer sediment profile was identified overlying a high-speed elastic basement.
The inversion successfully quantified uncertainties in the estimated parameters.

Conclusions:

The study provides robust estimates of seabed geoacoustic properties and roughness.
The findings support existing geological models of the Malta Plateau, including sand layers over limestone.
Bayesian inversion is effective for resolving complex seabed structures from acoustic data.