Ross ice shelf vibrations

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Bromirski, Peter D.
Diez, Anja
Gerstoft, Peter
Stephen, Ralph A.
Bolmer, S. Thompson
Wiens, Douglas A.
Aster, Richard C.
Nyblade, Andrew A.
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Ocean wave-ice shelf interactions
Infragravity waves
Dispersed gravity wave arrivals
Polarization analysis
Rayleigh-Lamb waves
Flexural waves
Broadband seismic stations were deployed across the Ross Ice Shelf (RIS) in November 2014 to study ocean gravity wave-induced vibrations. Initial data from three stations 100 km from the RIS front and within 10 km of each other show both dispersed infragravity (IG) wave and ocean swell-generated signals resulting from waves that originate in the North Pacific. Spectral levels from 0.001 to 10 Hz have the highest accelerations in the IG band (0.0025–0.03 Hz). Polarization analyses indicate complex frequency-dependent particle motions, with energy in several frequency bands having distinctly different propagation characteristics. The dominant IG band signals exhibit predominantly horizontal propagation from the north. Particle motion analyses indicate retrograde elliptical particle motions in the IG band, consistent with these signals propagating as Rayleigh-Lamb (flexural) waves in the ice shelf/water cavity system that are excited by ocean wave interactions nearer the shelf front.
Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 42 (2015): 7589–7597, doi:10.1002/2015GL065284.
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Geophysical Research Letters 42 (2015): 7589–7597
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