Ross Ice Shelf Icequakes Associated With Ocean Gravity Wave Activity

Z. Chen, P. D. Bromirski, P. Gerstoft, R. A. Stephen, W. S. Lee, S. Yun, S. D. Olinger, R. C. Aster, D. A. Wiens, Andrew Arnold Nyblade

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)8893-8902
Number of pages10
JournalGeophysical Research Letters
Volume46
Issue number15
DOIs
StatePublished - Aug 16 2019

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Ross ice shelf
ocean wave
ice shelf
gravity waves
gravity wave
oceans
land ice
hydrophone
sea ice
seismographs
hydrophones
seismograph
swell
transfer function
transfer functions
integrity
summer
seismicity
estimating
seafloor

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Chen, Z., Bromirski, P. D., Gerstoft, P., Stephen, R. A., Lee, W. S., Yun, S., ... Nyblade, A. A. (2019). Ross Ice Shelf Icequakes Associated With Ocean Gravity Wave Activity. Geophysical Research Letters, 46(15), 8893-8902. https://doi.org/10.1029/2019GL084123
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, Andrew Arnold. / Ross Ice Shelf Icequakes Associated With Ocean Gravity Wave Activity. In: Geophysical Research Letters. 2019 ; Vol. 46, No. 15. pp. 8893-8902.
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Chen, Z, Bromirski, PD, Gerstoft, P, Stephen, RA, Lee, WS, Yun, S, Olinger, SD, Aster, RC, Wiens, DA & Nyblade, AA 2019, 'Ross Ice Shelf Icequakes Associated With Ocean Gravity Wave Activity', Geophysical Research Letters, vol. 46, no. 15, pp. 8893-8902. https://doi.org/10.1029/2019GL084123

Ross Ice Shelf Icequakes Associated With Ocean Gravity Wave Activity. / 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, Andrew Arnold.

In: Geophysical Research Letters, Vol. 46, No. 15, 16.08.2019, p. 8893-8902.

Research output: Contribution to journalArticle

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Chen Z, Bromirski PD, Gerstoft P, Stephen RA, Lee WS, Yun S et al. Ross Ice Shelf Icequakes Associated With Ocean Gravity Wave Activity. Geophysical Research Letters. 2019 Aug 16;46(15):8893-8902. https://doi.org/10.1029/2019GL084123