Ross Ice Shelf vibrations

TitleRoss Ice Shelf vibrations
Publication TypeJournal Article
Year of Publication2015
AuthorsBromirski PD, Diez A., Gerstoft P, Stephen R.A, Bolmer T., Wiens D.A, Aster R.C, Nyblade A.
JournalGeophysical Research Letters
Date Published2015/09
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000363412400044
Keywordsantarctica; dispersed gravity; flexural; infragravity waves; ocean wave-ice shelf interactions; ocean waves; polarization analysis; Rayleigh-Lamb waves; wave arrivals; 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 100km from the RIS front and within 10km 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 10Hz have the highest accelerations in the IG band (0.0025-0.03Hz). 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.

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