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Estimation of seabed shear-wave velocity profiles using shear-wave source data.

Hefeng Dong¹, Thanh-Duong Nguyen, Kenneth Duffaut

¹Department of Electronics and Telecommunications, Norwegian University of Science and Technology, 7491 Trondheim, Norway. hefeng@iet.ntnu.no

The Journal of the Acoustical Society of America

|July 19, 2013

Summary

This study estimates seabed shear-wave velocity profiles using seismic interface waves. The results accurately determine sediment properties, crucial for marine geophysics and engineering applications.

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Area of Science:

Geophysics
Marine seismology

Background:

Accurate seabed shear-wave velocity profiles are essential for understanding sediment properties and seismic site response.
Traditional methods often face limitations in resolution and accuracy for near-surface sediments.

Purpose of the Study:

To estimate seabed shear-wave velocity profiles and their uncertainties.
To utilize interface-wave dispersion curves from shear-wave sources for improved velocity profiling.
To validate the estimated profiles against core and in situ measurements.

Main Methods:

Generation of seismic data using a polarized shear-wave source (2-60 Hz).
Extraction of Scholte- and Love-wave dispersion curves (fundamental and higher modes) using three time-frequency analysis methods.
Bayesian inversion with differential evolution and Metropolis-Hastings sampling for velocity model estimation.

Main Results:

Successful estimation of both vertically and horizontally polarized shear-wave velocity profiles.
Dispersion curves accurately represent wave propagation characteristics in sediments.
The Bayesian inversion provided robust estimates of shear-wave velocity profiles and their uncertainties.

Conclusions:

The applied method effectively determines seabed shear-wave velocity profiles.
The estimated profiles show good agreement with core and in situ measurements, validating the approach.
This technique offers a reliable tool for characterizing marine sediments and assessing seismic hazards.