Seismic detection and analysis of icequakes at Columbia Glacier, Alaska
Article first published online: 3 MAY 2007
Copyright 2007 by the American Geophysical Union.
Journal of Geophysical Research: Earth Surface (2003–2012)
Volume 112, Issue F3, September 2007
How to Cite
2007), Seismic detection and analysis of icequakes at Columbia Glacier, Alaska, J. Geophys. Res., 112, F03S23, doi:10.1029/2006JF000595., , , and (
- Issue published online: 3 MAY 2007
- Article first published online: 3 MAY 2007
- Manuscript Accepted: 6 NOV 2006
- Manuscript Revised: 2 OCT 2006
- Manuscript Received: 13 JUN 2006
- iceberg calving;
- tidewater glacier
 Contributions to sea level rise from rapidly retreating marine-terminating glaciers are large and increasing. Strong increases in iceberg calving occur during retreat, which allows mass transfer to the ocean at a much higher rate than possible through surface melt alone. To study this process, we deployed an 11-sensor passive seismic network at Columbia Glacier, Alaska, during 2004–2005. We show that calving events generate narrow-band seismic signals, allowing frequency domain detections. Detection parameters were determined using direct observations of calving and validated using three statistical methods and hypocenter locations. The 1–3 Hz detections provide a good measure of the temporal distribution and size of calving events. Possible source mechanisms for the unique waveforms are discussed, and we analyze potential forcings for the observed seismicity.