Registrations of seismic foci under mining coal seam - the experience of Polish mines

Mutke, Grzegorz (2013) Registrations of seismic foci under mining coal seam - the experience of Polish mines. Acta Geodynamica et Geomaterialia, 10 (2 (170). pp. 147-153. DOI: https://doi.org/10.13168/AGG.2013.0014

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Official URL: http://dx.doi.org/10.13168/AGG.2013.0014

Abstract

In the article the results of registering seismic events located under mining coal seam are presented. Such mining tremors have occurred in several Polish mines. The geological and mining conditions affecting the induction of that type of seismic events are shown. The mechanisms of deep seismic events (more than 1000m) triggered by mining are discussed in relation to regional geology. The most deep mining seismic events in Upper Silesia were related to regional geological structures focusing stress (e.g. syncline) or tectonic structures (younger faults), where mining stresses were only additional factor to trigger strong regional seismic events. The tremors were characterized by a shear mechanism in the source (double-couple forces). Tremors located directly under the performed operation, usually characterized by an uniaxial tension mechanism, associated with the regional tension axis and the space created during the operation of the coal seam, causing pushing loaded rock-mass into new gobs. Proposed methods of seismic monitoring for case of seismic events location under mining coal seam are discussed.

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Item Type: Article
Uncontrolled Keywords: depth of mining seismic events, location and mechanism of mining tremors
Subjects: Methodology > Method and procesing > Source parameter estimation
Region > Poland > Upper Silesia
Inducing technology > Underground mining
Project: IS-EPOS project > BOBREK MINE: Seismicity linked to longwall mining
EPOS-IP > BOBREK MINE: Seismicity linked to longwall mining