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


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 


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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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