Evanescent wave coupling in a geophysical system

Airborne acoustic signals from the Mw 8.1 Macquarie Ridge earthquake

Journal article (2014)
Department
Geoscience & Engineering (CEG) (TU Delft)
Copyright: © 2014 American Geophysical Union
DOI: https://doi.org/doi:10.1002/2013GL058801
Seismology Infrasound Hydroacoustics Earthquake
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Published Date

10-03-2014

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Source:

Geophysical Research Letters, 41 (5), 2014

ISSN:

0094-8276

Faculty

Civil Engineering and Geosciences

Department

Geoscience & Engineering

Abstract

Atmospheric low-frequency sound, i.e., infrasound, from underwater events has not been considered thus far, due to the high impedance contrast of the water-air interface making it almost fully reflective. Here we report for the first time on atmospheric infrasound from a large underwater earthquake (Mw 8.1) near the Macquarie Ridge, which was recorded at 1325 km from the epicenter. Seismic waves coupled to hydroacoustic waves at the ocean floor, after which the energy entered the Sound Fixing and Ranging channel and was detected on a hydrophone array. The energy was diffracted by a seamount and an oceanic ridge, which acted as a secondary source, into the water column followed by coupling into the atmosphere. The latter results from evanescent wave coupling and the attendant anomalous transparency of the sea surface for very low frequency acoustic waves.

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