Item: Results of recent infrasound avalanche monitoring studies
Title: Results of recent infrasound avalanche monitoring studies
Proceedings: Proceedings of the 2004 International Snow Science Workshop, Jackson Hole, Wyoming
Authors: Ernest D. Scott, Inter-Mountain Laboratories, Inc., Sheridan, WY Christopher T. Hayward Southern Methodist University Department of Geological Sciences, Dallas, TX Robert F. Kubichek, Jerry C. Hamann, John W. Pierre University of Wyoming
Abstract: Results of recent infrasound avalanche monitoring studies have advanced technological capabilities and provided further understanding of technological challenges. Avalanche identification performance of single sensor monitoring systems varies according to ambient noise and signal levels. While single sensor signal processing algorithms can identify avalanche activity, uncertainties (missed detections and false alarms) increase with increasing wind noise, and as signal levels decrease due to increasing distance or smaller sources. Multiple sensor signal processing algorithms substantially improves avalanche event identification robustness under windy and noisy conditions. Multiple sensor signal processing algorithms also allow location estimates of avalanche events to be made. An infrasound sensor array monitoring system has successfully demonstrated avalanche identification and localization capabilities. Also demonstrated were avalanche identification and localization capabilities of distributed networks of infrasound monitoring systems. Garnered knowledge is being ported into near real-time prototype systems that will be operated during the 2004/2005 winter in the Jackson Hole, Wyoming region. Prototype operation will provide performance evaluations in highway and recreational area settings, while facilitating development of a commercial form factor.
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Keywords: avalanche monitoring, infrasound, signal, correlation, beamforming, array processing
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