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Source mechanics for monochromatic icequakes produced during iceberg calving at Columbia Glacier, AK
Author(s) -
O'Neel Shad,
Pfeffer W. T.
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl031370
Subject(s) - ice calving , seismogram , geology , monochromatic color , glacier , iceberg , seismology , geodesy , geomorphology , physics , optics , ice sheet , lactation , biology , pregnancy , genetics
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.