|Title||Analysis of time and frequency domain of mining induced seismicity at Kidd Creek Mine, Ontario / Analyse temporelle et fréquencielle de la séismicité induite à la mine Kidd Creek, Ontario|
|Licence||Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences.|
|Source||Canada Centre for Mineral and Energy Technology, Mining Research Laboratories, Division Report MRL 92-079 (TR), 1992, 107 pages, https://doi.org/10.4095/328601 Open Access|
|Publisher||Energy, Mines and Resources Canada|
|Media||paper; on-line; digital|
|Lat/Long WENS|| -81.5000 -81.0000 48.7500 48.5000|
|Subjects||geophysics; Economics and Industry; Science and Technology; Health and Safety; mining; rockbursts; seismicity; seismic risk; seismology; seismographs; seismic waves; in-field instrumentation; Kidd Creek
Mine; induced seismicity; methodology; waveform analysis; algorithms|
|Illustrations||geoscientific sketch maps; location maps; spectra; plots; tables; flow charts|
|Released||1992 04 01; 2021 07 14|
|Abstract||The complex structural geology and deep mining level at the Kidd Creek Mine leads to increased levels of rockburst activity. A full waveform analysis of mining induced seismicity was therefore proposed
to Kidd Creek Mine of Falconbridge Ltd. by CANMET. Five hundred and ninety-one events were recorded by a portable seismograph (PDAS) between March and September 1991. Forty events were retained for analysis, consisting of mining induced seismic
events and a few blasts.|
Three types of waves were recorded: P- or compressional, S- or shear, and surface waves. The latter are rarely recorded in mining seismicity because the sensors are usually glued to bedrock. However, surface wave
propagation at Kidd Creek was recorded by a triaxial accelerometer placed on the concrete floor of a storage room.
Thirty-nine of the forty events recorded by the PDAS were also recorded by the Kidd Creek MP-250 rnicroseismic system, and located
using CANMET's BBLOCK program. Sixteen of these events were also located using the simplex algorithm. The two source location methods agree to within a few meters. On June 27 1991, a major rockburst of magnitude 2.6 Mn was recorded by the PDAS,
(which because of a power failure, was not recorded by the MP-250). The source location was estimated to be 441 meters away from the PDAS.
The source mechanism had a significantly higher shear than compression-dilatation component as illustrated
by the energy content of the P- and S-waves. The magnitude of events was estimated from the energy values with the events greater than 1.4 Mn being confirmed by the Geological Survey of Canada in Ottawa.
An attempt to analyze the data in the
frequency domain was made but due to short source-receiver distances, i.e., less than one kilometre, this analysis could not be performed. This was because the frequencies contained in the waves were higher than the maximum sampling rate and higher
than the 200 Hz hardware filter cut-off frequency, intrinsic to the PDAS.
However, recognition of this fact would enable a reasonable analysis of data to be done for any future study either by placing the PDAS further away from the seismic
activity or by designing a more adequate instrument.