Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 18, Pages 7589-7597Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL065284
Keywords
ocean wave-ice shelf interactions; infragravity waves; dispersed gravity wave arrivals; polarization analysis; Rayleigh-Lamb waves; flexural waves
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Funding
- NSF [PLR 1246151, PLR-1246416, PLR-1142518, 1141916, 1142126, OPP-0229546]
- California Department of Parks and Recreation, Division of Boating and Waterways [11-106-107]
- National Science Foundation [EAR-1261681]
- Directorate For Geosciences
- Division Of Earth Sciences [0944109] Funding Source: National Science Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1142518, 1246416, 1246151] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1141916, 1142126] Funding Source: National Science Foundation
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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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