Item: Calculating the Velocity of a Fast Moving Snow Avalanche Using an Infrasound Array
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Title: Calculating the Velocity of a Fast Moving Snow Avalanche Using an Infrasound Array
Proceedings: International Snow Science Workshop 2014 Proceedings, Banff, Canada
Authors:
- Scott Havens [ Center for Geophysical Investigation of the Shallow Subsurface, Boise State University, Boise, Idaho, USA ]
- Hans-Peter Marshall [ Center for Geophysical Investigation of the Shallow Subsurface, Boise State University, Boise, Idaho, USA ]
- Jeffery Johnson [ Center for Geophysical Investigation of the Shallow Subsurface, Boise State University, Boise, Idaho, USA ]
- Bill Nicholson [ Idaho Transportation Department, Boise, ID, USA ]
Date: 2014-09-29
Abstract: On January 19, 2012, a large D3 avalanche was recorded with an infrasound array ideally situated for observing the avalanche velocity. The avalanche crossed Highway 21 in Central Idaho during the largest avalanche cycle in the 15 years of operation and deposited approximately 8 meters of snow on the roadway. The avalanche velocity was calculated at a high spatial and temporal resolution during the 64 second event. Approximately 10 seconds prior to the main avalanche signal, a small signal originated from the direction of the start zone, which we infer to be the initial snow pack failure. The avalanche accelerated to a maximum velocity of 35.9 7.6msô€€€1 within 30 seconds before impacting the highway.
Object ID: ISSW14_paper_P2.45.pdf
Language of Article: English
Presenter(s):
Keywords: Snow avalanche, infrasound, avalanche velocity, snow dynamics
Page Number(s): 875-879
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