Source mechanics for monochromatic icequakes produced during iceberg calving at Columbia Glacier, AK
Article first published online: 21 NOV 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 22, November 2007
How to Cite
2007), Source mechanics for monochromatic icequakes produced during iceberg calving at Columbia Glacier, AK, Geophys. Res. Lett., 34, L22502, doi:10.1029/2007GL031370., and (
- Issue published online: 21 NOV 2007
- Article first published online: 21 NOV 2007
- Manuscript Accepted: 12 OCT 2007
- Manuscript Revised: 21 SEP 2007
- Manuscript Received: 18 JUL 2007
- spectral analysis
 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.