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- Title
The Influence of a Local Fault Zone on High Energy Tremor Occurrence During Longwall Mining of a Coal Seam.
- Authors
WOJTECKI, Łukasz; KNOPIK, Małgorzata; ZUBEREK, Wacław Marian
- 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.
- Subjects
POLAND; FAULT zones; EARTHQUAKES; LONGWALL mining; SEISMIC event location; SEISMIC waves; COAL mining; NODAL planes
- Publication
Acta Geophysica, 2016, Vol 64, Issue 4, p1164
- ISSN
1895-6572
- Publication type
Article
- DOI
10.1515/acgeo-2016-0040