This seismic event occurs when massive geological stresses overcome the strength of the rock mass or coal pillar, resulting in a sudden rupture. The release of energy shakes the surrounding workings and is often accompanied by a loud, explosive noise. Severe events can eject rock into the excavation, collapse supports, and disrupt ventilation.
We felt a heavy bump on the lower level right after the last face blast, so the deputy is checking the pillars.
Related terms
Same word, different worlds
To make a small adjustment to an offset or position, usually a thou or less, to bring a size in.
ElectrotechnologyTo energise a motor for a split second to check its direction of rotation before running it properly.
Boilers & BurnersTo energize a motor, pump or burner for a second or two to check rotation or operation.
Lighting & Color ScienceTo flash a channel or group to full instantly, usually with a console button, to identify it or for effect.
Asphalt PavingTo push excess mix off the old side of a joint back onto the hot mat with a lute so the rollers can pinch it in.
RailroadingTo use seniority to take a job held by someone junior, who is then displaced.