Physics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3422502o&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 22, CiteID L22502
Physics
8
Cryosphere: Glaciers, Cryosphere: Icebergs, Cryosphere: Glaciology (1621, 1827, 1863), Global Change: Cryospheric Change (0776), Seismology: General Or Miscellaneous
Scientific paper
Seismograms recorded during iceberg calving contain information pertaining to source processes during calving events. However, locally variable material properties may cause signal distortions, known as site and path effects, which must be eliminated prior to commenting on source mechanics. We applied the technique of horizontal/vertical spectral ratios to passive seismic data collected at Columbia Glacier, AK, and found no dominant site or path effects. Rather, monochromatic waveforms generated by calving appear to result from source processes. We hypothesize that a fluid-filled crack source model offers a potential mechanism for observed seismograms produced by calving, and fracture-processes preceding calving.
O'Neel Shad
Pfeffer Tad W.
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