Abstract
An unusual swarm-like seismic sequence occurred in April 1993 at the Western Deep Levels gold mine, South Africa. Altogether 199 events with moment magnitude from −0.5 to 3.1 were recorded and located by the mine seismic network. The sequence lasted 12 days and was composed in fact of four main shock-aftershocks sequences, closely following each other in space and time. The events were confined to a volume of rock extending to 670 m in the N-S, 630 m in the E-W, and 390 m in the vertical directions. The first sequence lasted 179 hours and the second only 13 hours, being interrupted by the third sequence which lasted 31 hours, being in turn interrupted by the fourth sequence. The parameter p, describing the rate of occurrence of aftershocks, ranged from 0.7 to 1. The first sequence is characterized by the lowest value of the fractal correlation dimension D = 1.75 and the second by the highest value of D = 2.4, whereas the third and fourth sequences are characterized by the middle value of D= 1.9.
The corner frequencies of P and S waves are in close proximity and range from 14 to 220 Hz. A display of source parameters as a function of time shows that the four main shocks are most distinctly marked by their source radius. For 46 events a moment tensor inversion was performed. In most cases the double-couple component is dominant, ranging from 60 to 90 percent of the solution. The double-couple solutions correspond to the same number of normal and reverse faults and oblique-slip focal mechanisms. An analysis of space distribution of P, T and B axes reveals that the distribution of B axes is the most regular.
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References
Aki, K. (1965), Maximum Likelihood Estimate of b in the Formula log N=a − bM and its Confidence Limits, Bull. Earthq. Res. Inst. Tokyo Univ. 43, 237–239.
Båk, P., and Tang, C. (1989), Earthquakes as a Self-organized Critical Phenomenon, J. Geophys. Res.94, 15,635–15,637.
Boatwright, J., and Fletcher, J. B. (1984), The Partition of Radiated Energy between P and S Waves, Bull. Seismol. Soc. Am. 74, 361–376.
Boore, D. M., and Boatwright, J. (1984), Average Body-wave Radiation Coefficients, Bull. Seismol. Soc. Am. 74, 1615–1621.
Brune, J. N. (1970), Tectonic Stress and the Spectra of Seismic Shear Waves from Earthquakes, J. Geophys. Res. 75, 4997–5009.
Brune, J. N. (1971), Correction, J. Geophys. Res. 76, 5002.
Bullen, K. E., and Bolt, B. A., An Introduction to the Theory of Seismology (Cambridge University Press, Cambridge 1985).
Fehler, M., and Phillips, W. S. (1991), Simultaneous Inversion for Q and Source Parameters of Microearthquakes Accompanying Hydraulic Fracturing in Granitic Rock, Bull. Seismol. Soc. Am. 81, 553–575.
Feignier, B., and Young, R. P. (1992), Moment Tensor Inversion of Induced Microseismic Events: Evidence of Non-shear Failures in the −4 < M < −2 Moment Magnitude Range, Geophys. Res. Lett. 19, 1503–1506.
Fujii, Y., and Sato, K., Difference in seismic moment tensors between microseismic events associated with a gas outburst and those induced by longwall mining activity. In Rockbursts and Seismicity in Mines (ed. Fairhurst, C.) (Balkema, Rotterdam 1990) pp. 71–75.
Gibowicz, S. J., and Wiejacz, P. (1994), A Search for the Source Non-shearing Components of Seismic Events Induced in Polish Coal Mines, Acta Geophys. Pol. 42, 81–110.
Gibowicz, S. J., Bober, A., Cichowicz, A., Droste, Z., Dychtowicz, Z., Hordejuk, J., Kazimierczyk, M., and Kijko, A. (1979), Source Study of the Lubin, Poland, Tremor of 24 March 1977, Acta Geophys. Pol. 27, 3–38.
Gibowicz, S. J., Niewiadomski, J., Wiejacz, P., and Domanski, B. (1989), Source Study of the Lubin, Poland, Mine Tremor of 20 June 1987, Acta Geophys. Pol. 37, 111–132.
Gibowicz, S. J., Harjes, H.-P., and Schafer, M. (1990), Source Parameters of Seismic Events at Heinrich Robert Mine, Ruhr Basin, Federal Republic of Germany: Evidence for Nondouble-couple Events, Bull. Seismol. Soc. Am. 80, 88–109.
Gibowicz, S. J., Young, R. P., Talebi, S., and Rawlence, D. J. (1991), Source Parameters of Seismic Events at the Underground Research Laboratory in Manitoba, Canada: Scaling Relations for the Events with Moment Magnitude Smaller than −2, Bull. Seismol. Soc. Am. 81, 1157–1182.
Guo, Z., and Ogata, Y. (1995), Correlation between Characteristic Parameters of Aftershock Distributions in Time, Space and Magnitude, Geophys. Res. Lett. 22, 993–996.
Hirabayashi, T., Ito, K., and Yoshii, T. (1992), Multifractal Analysis of Earthquakes, Pure Appl. Geophys. 138, 591–610.
Hirata, T. (1987), Omori’s Power Law Aftershock Sequences of Microfracturing in Rock Fracturing Experiments, J. Geophys. Res. 92, 6215–6221.
Hirata, T., Satoh, T., and Ito, K. (1987), Fractal Structure of Spatial Distribution of Microfracturing in Rock, Geophys. J. Roy. Astr. Soc. 67, 697–717.
Ito, K. (1992), Towards a New View of Earthquake Phenomena, Pure Appl. Geophys. 138, 531–548.
Ito, K., and Matsuzaki, M. (1990), Earthquakes as Self-organized Critical Phenomena, J. Geophys. Res. 95, 6853–6860.
Mcgarr, A. (1992a), An Implosive Component in the Seismic Moment Tensor of a Mining-induced Tremor, Geophys. Res. Lett. 19, 1579–1582.
McGarr, A. (1992b), Moment Tensors of Ten Witwatersrand Mine Tremors, Pure Appl. Geophys. 139, 781–800.
McGarr, A., and Green, R. W. E. (1978), Microtremor Sequences and Tilting in a Deep Mine, Bull. Seismol. Soc. Am. 68, 1679–1697.
Mandelbrot, B. B., The Fractal Geometry of Nature (Freeman, San Francisco 1982).
Mendecki, A. J., Real time quantitative seismology in mines. In Rockburts and Seismicity in Mines (ed. Young, R. P.) (Balkema, Rotterdam 1993) pp. 287–295.
Ogata, Y. (1983), Estimation of the Parameters in the Modified Omori Formula for Aftershock Frequencies by Maximum Likelihood Procedure, J. Phys. Earth 31, 115–124.
Sato, K., and Fujii, Y. (1989), Source Mechanism of a Large Scale Gas Outburst at Sunagawa Coal Mine in Japan, Pure Appl. Geophys. 129, 325–343.
Scherbaum, F. (1990), Combined Inversion for the Three-dimensional Q Structure and Source Parameters Using Microearthquake Spectra, J. Geophys. Res. 95, 12,423–12,438.
Snoke, J. A. (1987), Stable Determination of (Brune) Stress Drops, Bull. Seismol. Soc. Am. 77, 530–538.
Utsu, T. (1961), Statistical Study on the Occurrence of Aftershocks, Geophys. Mag. 30, 521–605.
Utsu, T. (1965), A Method for Determining the Value of b in the Formula log n = a − bM Showing the Magnitude-frequency Relation for Earthquakes, Bull. Hokkaido Univ. 13, 99–103.
Wiejacz, P. (1992), Calculation of Seismic Moment Tensor for Mine Tremors from the Legnica-Glogów Copper Basin, Acta Geophys. Pol. 40, 103–122.
Wiejacz, P., Moment tensors for seismic events from Upper Silesian coal mines, Poland. In Mechanics of Jointed and Faulted Rock (ed. Rossmanith, H.-P.) (Balkema, Rotterdam 1995) pp. 667–672.
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Gibowicz, S.J. (1997). An Anatomy of a Seismic Sequence in a Deep Gold Mine. In: Talebi, S. (eds) Seismicity Associated with Mines, Reservoirs and Fluid Injections. Pageoph Topical Volumes. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-8814-1_3
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DOI: https://doi.org/10.1007/978-3-0348-8814-1_3
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