Preliminary Observations of Acoustic Emissions Preceding Avalanches
R. A. SommerfeldU.S. Department of Agriculture Forest Service, Rocky Mountain Forest and Range Experiment Station, Fort Collins, Colorado 80521, U.S.A
1977en
ABI
Abstract
Abstract Spontaneous emissions of noise were monitored in a snowpack on an avalanche track using three geophones. 30 Hz noise was recorded on magnetic tape for the whole avalanche season and 3 Hz noise for a short period of time. Periods before and during avalanches were associated with high noise, while periods of known stability were associated with low noise.
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Cited by 20 references