Analysis of post-blasting source mechanisms of mining-induced seismic events in Rudna copper mine, Poland

Caputa, Alicja and Talaga, Adam and Rudzinski, Lukasz (2015) Analysis of post-blasting source mechanisms of mining-induced seismic events in Rudna copper mine, Poland. Contemporary Trends in Geoscience, 4 (1). DOI: https://doi.org/10.1515/ctg-2015-0003

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Official URL: http://doi.org/10.1515/ctg-2015-0003

Abstract

The exploitation of georesources by underground mining can be responsible for seismic activity in areas considered aseismic. Since strong seismic events are connected with rockburst hazard, it is a continuous requirement to reduce seismic risk. One of the most effective methods to do so is blasting in potentially hazardous mining panels. In this way, small to moderate tremors are provoked and stress accumulation is substantially reduced. In this paper we present an analysis of post-blasting events using Full Moment Tensor (MT) inversion at the Rudna mine, Poland, underground seismic network. In addition, we describe the problems we faced when analyzing seismic signals. Our studies show that focal mechanisms for events that occurred after blasts exhibit common features in the MT solution. The strong isotropic and small Double Couple (DC) component of the MT, indicate that these events were provoked by detonations. On the other hand, post-blasting MT is considerably different than the MT obtained for strong mining events. We believe that seismological analysis of provoked and unprovoked events can be a very useful tool in confirming the effectiveness of blasting in seismic hazard reduction in mining areas.

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Item Type: Article
Uncontrolled Keywords: source mechanism; blasting; foci
Subjects: Methodology > Method and procesing > Source parameter estimation
Region > Poland > Legnica-Glogow Copper District
Inducing technology > Underground mining
Project: IS-EPOS project
IS-EPOS project > LGCD: Regional seismicity and ground motion associating underground hard rock mining