Analysis of exceptionally large tremors in two gold mining districts of South Africa

McGarr, A.; Bicknell, J.; Sembera, E.; Green, R. W. E.

doi:10.1007/bf00874511

Cited by 33 publications

(21 citation statements)

References 8 publications

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“…The study in copper mines shows that the source radius of tremors can reach a few hundred metres, e.g. 100-200 m (Cichowicz 1981;Lizurek et al 2015), 400 and 533 m ( (McGarr et al 1989). Smaller radii were observed in a coal mine for the rockbursts (Dubiński et al 1996) of several to a dozen of metres.…”

Section: Seismic Source Parametersmentioning

confidence: 99%

“…The scalar seismic moment of relatively strong events in the mines varies for different induced tremors and depends on the source size and geology conditions. For example, in the deep gold mine, the seismic moments were 9.5-16.29 0 18 Nm for the magnitude of approximately four (M4 event) (McGarr et al 1989). The relatively weaker induced tremors (magnitude 2-3) in a Canadian copper mine were characterized by smaller M 0 , and their moment was 3.4-88.0 9 10 15 Nm (Table 1) (Trifu et al 1995).…”

Section: Seismic Source Parametersmentioning

confidence: 99%

“…deep gold mines (McGarr et al 1989), copper mines (Trifu et al 1995;Orlecka-Sikora et al 2012;Lizurek and Wiejacz 2012;Lizurek et al 2015;Rudzinski et al 2016) and coal mines (Gibowicz and Kijko 1994;Dubiński et al 1996)], but it is rare for destress blasting effects (e.g. Srinivasan et al 2005).…”

Section: Seismic Source Parametersmentioning

confidence: 99%

“…The source radius of mining tremors is close to an exploitation field length (a longwall length) or can inclusion a slip at the level of mining workings in the entire seismic deformation if the event occurs much higher than the mining level (McGarr et al 1989). Moreover, the rapture area is inversely proportional to the corner frequency, which depends on the rapture process, and if the range of failure scales increases, the rapture process becomes more complex (McGarr et al 1989). The study in copper mines shows that the source radius of tremors can reach a few hundred metres, e.g.…”

Section: Seismic Source Parametersmentioning

confidence: 99%

“…The scalar seismic moment M o most reliably estimates the size of a tremor and can be calculated as follows (Aki and Richards 1980;McGarr et al 1989;Trifu et al 1995):…”

Section: Seismic Source Parametersmentioning

confidence: 99%

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Determination of Destress Blasting Effectiveness Using Seismic Source Parameters

Wojtecki¹,

Mendecki

Zuberek

2017

Rock Mech Rock Eng

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Underground mining of coal seams in the Upper Silesian Coal Basin is currently performed under difficult geological and mining conditions. The mining depth, dislocations (faults and folds) and mining remnants are responsible for rockburst hazard in the highest degree. This hazard can be minimized by using active rockburst prevention, where destress blastings play an important role. Destress blastings in coal seams aim to destress the local stress concentrations. These blastings are usually performed from the longwall face to decrease the stress level ahead of the longwall. An accurate estimation of active rockburst prevention effectiveness is important during mining under disadvantageous geological and mining conditions, which affect the risk of rockburst. Seismic source parameters characterize the focus of tremor, which may be useful in estimating the destress blasting effects. Investigated destress blastings were performed in coal seam no. 507 during its longwall mining in one of the coal mines in the Upper Silesian Coal Basin under difficult geological and mining conditions. The seismic source parameters of the provoked tremors were calculated. The presented preliminary investigations enable a rapid estimation of the destress blasting effectiveness using seismic source parameters, but further analysis in other geological and mining conditions with other blasting parameters is required.

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Section: Seismic Source Parametersmentioning

confidence: 99%

Section: Seismic Source Parametersmentioning

confidence: 99%

Section: Seismic Source Parametersmentioning

confidence: 99%

Section: Seismic Source Parametersmentioning

confidence: 99%

“…The scalar seismic moment M o most reliably estimates the size of a tremor and can be calculated as follows (Aki and Richards 1980;McGarr et al 1989;Trifu et al 1995):…”

Section: Seismic Source Parametersmentioning

confidence: 99%

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