Analysis of seismic signatures from gas- and dust-based explosions at the Lake Lynn Experimental Mine.

Examination of seismic records during the time interval of the Sago Mine disaster in 2006 revealed a small amplitude signal possibly associated with an event in the mine. More needs to be understood about the seismicity from mine explosions to properly interpret critical seismic information. A seismic monitoring system located at NIOSH's Lake Lynn Experimental Mine has monitored experimental gas and dust-based explosions and impact tests. The seismic signatures from these different events were analyzed using standard waveform analysis procedures. The magnitude of seismic energy during a gas and dust explosion was found to be more dependent on mine entry geometry and seal behavior rather than on the amount of explosive fuel present. The results suggest a large explosion that is not restricted can generate potentially the same magnitude as a small explosion that is restricted. [ABSTRACT FROM AUTHOR]