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Source mechanics for monochromatic icequakes produced during iceberg calving at Columbia Glacier, AK
Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA
Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA
Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA
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.
Received 18 July 2007; accepted 12 October 2007; published 21 November 2007.
Citation: (2007), Source mechanics for monochromatic icequakes produced during iceberg calving at Columbia Glacier, AK, Geophys. Res. Lett., 34, L22502, doi:10.1029/2007GL031370.
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