Record details

    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
    Šílený, Jan
    Controlling seismic hazard and sustainable development of deep mines (7. : 21.08.2009-23.08.2009 : Dalian, Čína)
Publication type
    konferenční příspěvek (zahraniční konference)
Source title - monograph
    Controlling seismic hazard and sustainable development of deep mines: 7th International symposium on rockburst and seismicity in mines (RASIM7). Vol. 1
    S. 399-406
    Projekt: GA205/09/0724, GA ČR3cav_un_auth*0252832
    Rozsah: 8 s.
    Výzkumný záměr: CEZ:AV0Z30120515
Subject category
    mining tremors
    Moab Khotsong mine
    moment tensors
Abstract (in english)
   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.
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
Import date
    9. 12. 2013