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Seismic velocity distribution in the vicinity of a mine tunnel at Thabazimbi, South Africa

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dc.contributor.author Wright, C en_US
dc.contributor.author Walls, EJ en_US
dc.contributor.author De J Carneiro, D en_US
dc.date.accessioned 2007-02-06T09:15:08Z en_US
dc.date.accessioned 2007-06-07T10:09:57Z
dc.date.available 2007-02-06T09:15:08Z en_US
dc.date.available 2007-06-07T10:09:57Z
dc.date.copyright en_US
dc.date.issued 2000-07 en_US
dc.identifier.citation Wright, C, Walls. EG and De J Carneiro, D. 2000. Seismic velocity distribution in the vicinity of a mine tunnel at Thabazimbi, South Africa. Journal of Applied Geophysics, vol. 44(4), pp 369-382 en_US
dc.identifier.issn 0926-9851 en_US
dc.identifier.uri http://hdl.handle.net/10204/1500 en_US
dc.identifier.uri http://hdl.handle.net/10204/1500
dc.description.abstract Analysis of the refracted arrivals on a seismic reflection profile recorded along the wall of a tunnel at an iron mine near Thabazimbi, South Africa, shows variations in P-wave velocity in dolomite away from the de-stressed zone that vary between 4.4 and 7.2 km/s, though values greater than 5.8 km/s predominate along most of the profile. The seismic velocities at the tunnel wail, however, vary between 4.2 and 5.2 km/s. Time-depth terms are in the range from 0.1 to 0.9 ms, and yield thicknesses of the zone disturbed by the tunnel excavations of between 2 and 9 m. The very low seismic velocities away from the tunnel wall in two regions are associated with alcoves or 'cubbies' involving offsets in the wall of up to 10 m. The large variations in seismic velocity resolved over distances less than 15 m with signals of wavelength around 6-9 m are attributed to variations in the sizes and concentrations of fracture systems and cracks, and in the degree of groundwater saturation of the fracture systems. The results suggest that seismic velocity variations from reflection surveys may also assist modelling studies of the stress regime in deep mines, particularly if both P and S wave velocity variations can be determined. The seismic velocity variations inferred also show that application of refraction static corrections in the processing of 'in-mine' seismic reflection profiles is as important as in surface surveys, because of the higher frequencies of the seismic energy recorded in the deep mine environment. en_US
dc.format.extent 867351 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en en_US
dc.publisher Elsevier Science BV en_US
dc.rights Copyright: 2000 Elsevier Science BV en_US
dc.source en_US
dc.subject Seismic reflection profiles en_US
dc.subject Mine tunnels en_US
dc.subject Seismic velocity distribution en_US
dc.subject Thabazimbi en_US
dc.subject Geosciences en_US
dc.subject Mineral processing en_US
dc.subject Mining en_US
dc.title Seismic velocity distribution in the vicinity of a mine tunnel at Thabazimbi, South Africa en_US
dc.type Article en_US
dc.identifier.apacitation Wright, C., Walls, E., & De J Carneiro, D. (2000). Seismic velocity distribution in the vicinity of a mine tunnel at Thabazimbi, South Africa. http://hdl.handle.net/10204/1500 en_ZA
dc.identifier.chicagocitation Wright, C, EJ Walls, and D De J Carneiro "Seismic velocity distribution in the vicinity of a mine tunnel at Thabazimbi, South Africa." (2000) http://hdl.handle.net/10204/1500 en_ZA
dc.identifier.vancouvercitation Wright C, Walls E, De J Carneiro D. Seismic velocity distribution in the vicinity of a mine tunnel at Thabazimbi, South Africa. 2000; http://hdl.handle.net/10204/1500. en_ZA
dc.identifier.ris TY - Article AU - Wright, C AU - Walls, EJ AU - De J Carneiro, D AB - Analysis of the refracted arrivals on a seismic reflection profile recorded along the wall of a tunnel at an iron mine near Thabazimbi, South Africa, shows variations in P-wave velocity in dolomite away from the de-stressed zone that vary between 4.4 and 7.2 km/s, though values greater than 5.8 km/s predominate along most of the profile. The seismic velocities at the tunnel wail, however, vary between 4.2 and 5.2 km/s. Time-depth terms are in the range from 0.1 to 0.9 ms, and yield thicknesses of the zone disturbed by the tunnel excavations of between 2 and 9 m. The very low seismic velocities away from the tunnel wall in two regions are associated with alcoves or 'cubbies' involving offsets in the wall of up to 10 m. The large variations in seismic velocity resolved over distances less than 15 m with signals of wavelength around 6-9 m are attributed to variations in the sizes and concentrations of fracture systems and cracks, and in the degree of groundwater saturation of the fracture systems. The results suggest that seismic velocity variations from reflection surveys may also assist modelling studies of the stress regime in deep mines, particularly if both P and S wave velocity variations can be determined. The seismic velocity variations inferred also show that application of refraction static corrections in the processing of 'in-mine' seismic reflection profiles is as important as in surface surveys, because of the higher frequencies of the seismic energy recorded in the deep mine environment. DA - 2000-07 DB - ResearchSpace DP - CSIR KW - Seismic reflection profiles KW - Mine tunnels KW - Seismic velocity distribution KW - Thabazimbi KW - Geosciences KW - Mineral processing KW - Mining LK - https://researchspace.csir.co.za PY - 2000 SM - 0926-9851 T1 - Seismic velocity distribution in the vicinity of a mine tunnel at Thabazimbi, South Africa TI - Seismic velocity distribution in the vicinity of a mine tunnel at Thabazimbi, South Africa UR - http://hdl.handle.net/10204/1500 ER - en_ZA


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