Acta Geophysica

, Volume 64, Issue 4, pp 1164–1175 | Cite as

The Influence of a Local Fault Zone on High Energy Tremor Occurrence During Longwall Mining of a Coal Seam

  • Łukasz Wojtecki
  • Małgorzata Knopik
  • Wacław Marian Zuberek
Open Access
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Abstract

Underground mining of coal seams in the Upper Silesian Coal Basin in Poland is accompanied by seismic activity of varying magnitude. The investigations which have been performed for several years distinguished high energy mine tremors connected directly with mining or coupled with geological structures, such as large faults. In mined seams, local fault zones occur. Faults in these zones are usually small, with throws comparable with coal seams thicknesses. Local fault zone may be responsible for the occurrence of high energy tremors as well as large faults, as presented in this article. An analysis of source mechanism of high energy tremors generated during longwall mining of the coal seam No. 510, with presence of a local fault zone, in one of the Polish hard coal mines in the Upper Silesian Coal Basin was performed. For this purpose, the seismic moment tensor inversion method was used. In most of foci, the process of shear predominated. Determined nodal plane parameters were correlated with parameters of faults forming the local fault zone. High energy tremors were generated mostly by dislocations on faults of the local fault zone. Weakening of roof rocks in the neighborhood of local fault zone takes an important role too, and was responsible for share of implosion in the focal mechanism.

Key words

mine tremors focal mechanism seismic moment tensor underground coal mining 

References

  1. Aki, K., and P.G. Richards (1980), Quantitative Seismology–Theory and Methods, Vols. 1, 2, W.H. Freeman & Co., San Francisco.Google Scholar
  2. Gibowicz, S.J. (1995), Mechanism of tremor foci, mining tremors — mechanism, location and energy. In: Proc. School of Underground Mining, 27 February–3 March 1995, Szczyrk, Poland, 5–30 (in Polish).Google Scholar
  3. Gibowicz, S.J., and A. Kijko (1994), An Introduction to Mining Seismology, Academic Press, San Diego.Google Scholar
  4. Knopik, M., W.M. Zuberek, and Ł. Wojtecki (2015), Multisources of high-energy mine tremors occuring during longwall mining of coal seam in varied geological and mining conditions, Prz. Górn. 12, 12–19 (in Polish).Google Scholar
  5. Kołodziejczyk, P. (2009), Optimization of the seismic network in Kompania Węglowa S.A., Tech. Report, SITG, Gliwice (in Polish, unpublished).Google Scholar
  6. Kwiatek, G. (2009), Foci-seismic moment tensor–spectral parameters: A description of the program, available from: http://induced.pl/foci.Google Scholar
  7. Marcak, H., and W.M. Zuberek (1994), Mining Geophysics, Śląskie Wydawnictwo Techniczne, Katowice (in Polish).Google Scholar
  8. Stec, K. (2009), The focal mechanism and the methods of its calculation. In: Workshop of the “Natural Hazards in the Mining Industry”, 17–19 June 2009, Bogatynia-Świeradów Zdrój, Poland, 287–305 (in Polish).Google Scholar
  9. Stec, K., and Ł. Wojtecki (2011), Characteristics of the mine tremor source mechanism associated with the mining in the seam 510, the longwall 502 in the “Bielszowice” Coal Mine, Res. Rep. Centr. Min. Inst.: Min. Environ. 1, 61–77 (in Polish).Google Scholar

Copyright information

© Wojtecki et al. 2016

Authors and Affiliations

  • Łukasz Wojtecki
    • 1
  • Małgorzata Knopik
    • 2
  • Wacław Marian Zuberek
    • 2
  1. 1.Kompania Węglowa S.A.KatowicePoland
  2. 2.Faculty of Earth SciencesUniversity of Silesia in KatowiceSosnowiecPoland

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