Item: Infrasonic monitoring of avalanche activity
Title: Infrasonic monitoring of avalanche activity
Proceedings: 2002 International Snow Science Workshop, Penticton, British Columbia
Authors: Ernest D. Scott and Craig Lance, Inter-Mountain Laboratories, Inc., Sheridan, Wyoming
Abstract: Avalanches have been shown to produce sub-audible acoustic pressure fluctuations in the low frequency infrasonic spectrum, but limited information that specifically details avalanche-generated infrasound exists in open literature. During the winters of2000/2001 and 200112002, single sensor infrasonic monitoring systems were deployed at several locations to collect data aimed at characterizing infrasonic signals produced by avalanche activity. Results obtained from these efforts verify the existence of avalanche-generated infrasound. While the frequency content of the recorded avalanche-generated infrasonic signals is consistent with previous research fmdings, the near source amplitudes of the infrasonic pressure fluctuations were found to be an order of magnitude lower than previous research findings. Collected data also contains information regarding potential interfering noise sources. The obtained catalog of data is being analyzed to investigate the variability in the statistical characteristics of infrasound produced by avalanches. These findings are being utilized to develop signal processing algorithms to employ in automated avalanche detection systems. Research efforts related to the development of automated avalanche detection systems will continue through August 2003.
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Keywords: avalanche monitoring, avalanche detection, infrasound
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