Near-surface environmentally forced changes in the Ross Ice Shelf observed with ambient seismic noise
Geophysical Research Letters
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Abstract
Continuous seismic observations across the Ross Ice Shelf reveal ubiquitous ambient res-
onances at frequencies >5 Hz. These firn-trapped surface wave signals arise through wind
and snow bedform interactions coupled with very low velocity structures. Progressive and long-term spectral changes are associated with surface snow redistribution by wind
and with a January 2016 regional melt event. Modeling demonstrates high spectral sen-
sitivity to near-surface (top several m) elastic parameters. We propose that spectral peak changes arise from surface snow redistribution in wind events, and to velocity drops re-
flecting snow lattice weakening near 0◦C for the melt event. Percolation-related refrozen
layers and layer thinning may also contribute to long-term spectral changes after the melt
event. Single-station observations are inverted for elastic structure for multiple stations across the ice shelf. High-frequency ambient noise seismology presents opportunities for
continuous assessment of near surface ice shelf or other firn environments.
Suggested Citation
Chaput, J., Aster, R., McGrath, D., Baker, M., Anthony, R.E., Gerstoft, P., Bromirski, P., Nyblade, A., Stephen, R., Wiens, D., 2019, Near-surface environmentally forced changes in the Ross Ice Shelf observed with ambient seismic noise: Geophysical Research Letters, v. 45, no. 11, p. 11,187-11,196, https://doi.org/10.1029/2018GL079665.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Near-surface environmentally forced changes in the Ross Ice Shelf observed with ambient seismic noise |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2018GL079665 |
| Volume | 45 |
| Issue | 11 |
| Publication Date | October 16, 2018 |
| Year Published | 2019 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Geologic Hazards Science Center |
| Description | 10 p. |
| First page | 11,187 |
| Last page | 11,196 |
| Other Geospatial | Ross Ice Shelf |