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Modeling explosion generated Scholte waves in sandy sediments with power law dependent shear wave speed
Alexander G Soloway1, Peter H Dahl2, Robert I Odom3
1Department of Mechanical Engineering, University of Washington, 1013 Northeast 40th Street, Seattle, Washington 98105, USA soloway@u.washington.edu.
The Journal of the Acoustical Society of America
|November 2, 2015
Summary
This study models underwater explosion-generated Scholte waves in sandy seabeds. Dispersion is accurately predicted using a power-law shear wave speed profile and an empirical source model.
Area of Science:
- Geophysics
- Acoustics
- Oceanography
Background:
- Scholte waves are seismic waves that propagate along the seabed.
- Underwater explosions generate acoustic signals that can create Scholte waves.
- Understanding these waves is crucial for marine seismic surveys and defense applications.
Purpose of the Study:
- To present experimental measurements of Scholte waves from underwater explosions.
- To model the dispersion of explosion-generated Scholte waves in a sandy seabed.
- To develop an empirical source model for underwater explosions.
Main Methods:
- Collected experimental data of Scholte waves from underwater explosions off Virginia Beach, VA.
- Utilized a power-law dependent shear wave speed profile for the sandy seabed.
- Employed an empirical source model to determine the pressure time-series near the source.
Main Results:
- Demonstrated that Scholte wave dispersion in a sandy seabed can be modeled effectively.
- Validated the power-law shear wave speed profile and empirical source model.
- Showcased the relationship between TNT-equivalent charge weight and pressure time-series.
Conclusions:
- The dispersion of explosion-generated Scholte waves in sandy seabeds is predictable.
- A combination of a power-law shear wave speed profile and an empirical source model accurately describes these phenomena.
- This research provides a valuable tool for analyzing underwater explosion acoustics and seismic signatures.
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