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Seismic Monitoring in Mines (Hardcover, 1997 ed.)
Loot Price: R5,310
Discovery Miles 53 100
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Seismic Monitoring in Mines (Hardcover, 1997 ed.)
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Routine seismic monitoring in mines was introduced over 30 years
ago with two main objectives in mind: * immediate location of
larger seIsmIC events to guide rescue operations; * prediction of
large rockmass instabilities. The first objective was achieved
fairly quickly, but with the subsequent development of mine
communication systems, its strategic importance has diminished. The
very limited success with prediction can, at least partially, be
attributed to three factors: * seismic monitoring systems based on
analogue technology that provided noisy and, frequently, poorly
calibrated data of limited dynamic range; * the non-quantitative
description of a seismic event by at best its local magnitude; and
* the resultant non-quantitative analysis of seismicity, frequently
through parameters of some statistical distributions, with a
somewhat loose but imaginative physical interpretation. The
introduction of modern digital seismic systems to mines and
progress in the theory and methods of quantitative seismology have
enabled the implementation of realtime seismic monitoring as a
management tool, quantifying rockmass response to mining and
achieving the first tangible results with prediction. A seismic
event, being a sudden inelastic deformation within the rockmass,
can now routinely be quantified in terms of seismic moment, its
tensor, and radiated seismic energy, so that the overall size of,
and stress released at, the seismic source can be estimated.
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