Moment tensors of mining tremors - detection tool of the mode of rock-mass fracturing: mechanism of deep events on October 24 and October 12, 2005 in Moab Khotsong mine, S. Africa

0333934 - GFÚ 2010 RIV US eng C - Conference Paper (international conference)
Šílený, Jan
Moment tensors of mining tremors - detection tool of the mode of rock-mass fracturing: mechanism of deep events on October 24 and October 12, 2005 in Moab Khotsong mine, S. Africa.
Controlling seismic hazard and sustainable development of deep mines: 7th International symposium on rockburst and seismicity in mines (RASIM7). Vol. 1. Paramus: Rinton Press, 2009 - (Tang, C.), s. 399-406. ISBN 978-1-58949-058-1.
[Controlling seismic hazard and sustainable development of deep mines /7./. Dalian (CN), 21.08.2009-23.08.2009]
R&D Projects: GA ČR GA205/09/0724
Institutional research plan: CEZ:AV0Z30120515
Keywords : moment tensors * mining tremors * Moab Khotsong mine
Subject RIV: DC - Siesmology, Volcanology, Earth Structure

Contrary to natural earthquakes, where the features of the geological environ without void spaces and the character of loading naturally favor shear slip, in foci of seismic events induced by man-made activities there is a physically based reason for occurence of non-shear processes. Especially in mines, the existence of mined-out cavities enables implosive events which are improbable among natural earthquakes. In particular, great depth of excavation typically occurring in gold ore mining results in extreme loading of mine structures underground. High stress concentrations cause collapsing of excavated cavities, which is reflected by specific non-double-couple mechanisms. Apart from mining tremors, natural earthquakes of a tectonic origin may occur in the area where mining activity takes place.
Permanent Link: http://hdl.handle.net/11104/0178796