| Title | Study of microseismic emissions from a pit slope |
| Author | Vladut, T I |
| Source | Canada Centre for Mineral and Energy Technology, Energy Research Program Report, Coal Research Laboratories 85-1(OP), 1985, 10 pages, https://doi.org/10.4095/304772 |
| Year | 1985 |
| Publisher | Energy, Mines and Resources Canada |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
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| Released | 1985 01 01 |
| Abstract | (Summary)
Preliminary results and analyses are presented of microseismic measurements made on a coal mine slope as the pit bottom was lowered and the slope deformed. The field study was
carried out in collaboration with the U.S. Bureau of Mines and the mine operator and is part of an evaluation of the applicability of modern microseismic techniques to predict the stability of geologic structures. U.S. Bureau of Mines microseismic
monitoring equipment developed especially for such purposes was used. Overall the variation in microseismic activity corresponds well to the movement of the slope. A significant number of events is taken to be about 30 per hour and only about 20% of
the registered events is locatable i.e. registered on four or more geophones. This suggests that microseismic data should only be used as an auxiliary form of monitoring. As such consideration might be given to using a simpler monitoring system and
using only unique events (registered only one geophone) as a basis for decision. Evidence is presented to show that microseismic activity peaks several hours to a day before slope movement as defined by electronic distance measurements increases. It
is concluded that microseismic monitoring system must be installed at an early stage: that the location of the seismic events should only be the first step in the analysis and further work should be directed toward simultaneous analysis in the
field. |
| GEOSCAN ID | 304772 |
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