Ambiguous, preliminary evidence indicates that a coal mine cave-in that trapped six miners early Monday in Utah generated seismic waves that were recorded as a magnitude-3.9 earthquake, according to the University of Utah Seismograph Stations.
Ambiguous, preliminary evidence indicates that a coal mine cave-in that trapped six miners early Monday in Utah generated seismic waves that were recorded as a magnitude-3.9 earthquake, according to the University of Utah Seismograph Stations.