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

IF 2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Ł. Wojtecki, M. Knopik, W. Zuberek
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引用次数: 10

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.
局部断裂带对煤层长壁开采中高能震颤发生的影响
波兰上西里西亚煤盆地煤层的地下开采伴随着不同震级的地震活动。几年来进行的调查区分出与采矿直接相关或与地质构造(如大断层)耦合的高能矿震。在开采的煤层中,会出现局部断裂带。这些地区的断层通常很小,抛物厚度与煤层厚度相当。局部断裂带可能是高能地震和大断层发生的原因,正如本文所介绍的那样。对上西里西亚煤盆地波兰硬煤矿510号煤层长壁开采过程中存在局部断裂带的高能地震震源机制进行了分析。为此,采用地震矩张量反演方法。在大多数震源中,剪切过程占主导地位。确定的节点面参数与形成局部断裂带的断层参数相关。高能地震主要由局部断裂带断层上的位错引起。局部断裂带附近顶板的弱化也起着重要作用,并对内爆在震源机制中的份额负责。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta Geophysica
Acta Geophysica 地学-地球化学与地球物理
CiteScore
3.90
自引率
13.00%
发文量
251
审稿时长
5.3 months
期刊介绍: Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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