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Topographic effects on infrasound propagation.

Mihan H McKenna¹, Robert G Gibson, Bob E Walker

¹Geotechnical and Structures Laboratory, US Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, Mississippi 39180, USA. Mihan.h.mckenna@usace.army.mil

The Journal of the Acoustical Society of America

|January 28, 2012

Summary

This summary is machine-generated.

Topography significantly impacts infrasound signals, affecting amplitude and waveform complexity. Complex terrain scattering and absorption influence infrasonic energy more than previously understood.

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Area of Science:

Geophysics
Acoustics
Seismology

Background:

Infrasound propagation is influenced by atmospheric conditions and Earth's surface.
Topographical features can alter acoustic wave propagation, affecting signal characteristics.

Purpose of the Study:

To quantify the effects of variable topography on infrasound signal amplitude and waveform.
To investigate infrasound propagation from explosive sources within 25 km.

Main Methods:

Collected infrasound data using portable arrays during the Frozen Rock Experiment (FRE).
Employed numerical simulations with a time-domain parabolic equation model incorporating terrain masking and meteorological profiles.

Main Results:

Observed infrasound signals showed variations in amplitude and complexity attributed to topography.
Simulations accurately predicted signal timing but underestimated waveform amplitude behind terrain features.
Variable topography influences infrasonic energy through complex scattering and absorption.

Conclusions:

Topography plays a crucial role in shaping observed infrasound signals.
Current models may underestimate the impact of complex terrain on infrasound propagation.
Further research is needed to fully understand terrain-acoustic interactions.