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Microseismic Investigations in Coal Mines.

Authors
Leighton-FW; Steblay-BJ; Hooker-VE
Source
Am Min Cong J 1974 Oct; 10(60):66-71
Link
NIOSHTIC No.
10009537
Abstract
Rock noises were monitored in a deep western Colorado coal mine and include data preceding several bounces (release of seismic energy large enough to be damaging or felt by nearby personnel) of varying magnitudes. Techniques were developed to locate and delineate bounce areas. These data indicate that microseismic techniques may be used to establish where and when coal mine bounces will occur. Microseismic equipment was also used to monitor a controlled roof fall experiment. This equipment detects microseismic noises of ultrasonic frequencies and translates these frequencies down to the audible range. This minimizes background noise. Results of this initial experiment indicate that the peak buildup of rock noise occurred about 15 minutes prior to roof failure.
Publication Date
19741001
Document Type
OP;
Fiscal Year
1975
NTIS Accession No.
NTIS Price
Identifying No.
OP 7-75
Issue of Publication
60
NIOSH Division
DRC;
Source Name
Am. Min. Cong. J., V. 10, No. 60, October 1974, PP. 66-71
State
CO;
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