Ross ice shelf icequakes associated with ocean gravity wave activity

Alternative Title
Date Created
Related Materials
Replaced By
Ice shelf
Gravity wave
Transfer function
Gravity waves impacting ice shelves illicit a suite of responses that can affect ice shelf integrity. Broadband seismometers deployed on the Ross Ice Shelf, complemented by a near‐icefront seafloor hydrophone, establish the association of strong icequake activity with ocean gravity wave amplitudes (AG) below 0.04 Hz. The Ross Ice Shelf‐front seismic vertical displacement amplitudes (ASV) are well correlated with AG, allowing estimating the frequency‐dependent transfer function from gravity wave amplitude to icefront vertical displacement amplitude (TGSV(f)). TGSV(f) is 0.6–0.7 at 0.001–0.01 Hz but decreases rapidly at higher frequencies. Seismicity of strong icequakes exhibits spatial and seasonal associations with different gravity wave frequency bands, with the strongest icequakes observed at the icefront primarily during the austral summer when sea ice is minimal and swell impacts are strongest.
Author Posting. © American Geophysical Union, 2019. 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 46(15), (2019): 8893-8902, doi:10.1029/2019GL084123.
Embargo Date
Chen, Z., Bromirski, P. D., Gerstoft, P., Stephen, R. A., Lee, W. S., Yun, S., Olinger, S. D., Aster, R. C., Wiens, D. A., & Nyblade, A. A. (2019). Ross ice shelf icequakes associated with ocean gravity wave activity. Geophysical Research Letters, 46(15), 8893-8902.
Cruise ID
Cruise DOI
Vessel Name