Seismic detection and analysis of icequakes at Columbia Glacier, Alaska
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Abstract
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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Seismic detection and analysis of icequakes at Columbia Glacier, Alaska |
| Series title | Journal of Geophysical Research |
| DOI | 10.1029/2006JF000595 |
| Volume | 112 |
| Issue | F3 |
| Year Published | 2007 |
| Language | English |
| Publisher | AGU |
| Contributing office(s) | Alaska Science Center |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |