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Published on: May 1, 2018
Long-range atmospheric infrasound propagation from subsurface sources
Gil Averbuch1, Jelle D Assink2, Läslo G Evers2
1Department of Geoscience and Engineering, Faculty of Civil Engineering and Geosciences, Delft University of Technology, 1 Stevinweg Street, Delft, The Netherlands.
Subsurface sources generate infrasound detected in the atmosphere. This study models seismo-acoustic coupling, revealing evanescent waves and leaky surface waves drive long-range infrasound, with source depth influencing propagation paths.
Area of Science:
- Seismology
- Ocean Acoustics
- Atmospheric Acoustics
Background:
- Traditional models treat Earth-atmosphere interfaces as free or rigid surfaces, limiting wave transmission.
- Observed infrasound from subsurface sources contradicts these simplified interface assumptions.
Purpose of the Study:
- To model seismo-acoustic coupling for infrasound propagation from underwater and underground sources.
- To analyze the mechanisms responsible for long-range infrasound transmission into the atmosphere.
Main Methods:
- Utilized the Fast Field Program (FFP) for seismo-acoustic modeling.
- Analyzed coupling mechanisms in the frequency-wavenumber domain.
- Varied source and media parameters to understand their influence.
Main Results:
- Identified evanescent wave coupling and leaky surface waves as key contributors to long-range infrasound.
- Demonstrated that source depth significantly impacts the amplitude of stratospheric and tropospheric infrasound phases.
Conclusions:
- Evanescent waves and leaky surface waves are crucial for understanding infrasound propagation from subsurface sources.
- Source depth is a critical parameter for infrasound propagation, offering potential for future source localization.
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