Kassa, BBJulia, JNyblade, AADurrheim, RJ2009-10-232009-10-232009-09Kassa, BB, Julia, J, Nyblade, AA and Durrheim, RJ. 2009. Source mechanisms of mining-related seismic events in the Far West Rand, South Africa. 11th South African Geophysical Association Biennial Technical Meeting and Exhibition, Swaziland, 16-18 September 2009, pp 69-729780620446020http://hdl.handle.net/10204/368411th South African Geophysical Association Biennial Technical Meeting and Exhibition, Swaziland, 16-18 September 2009The Far West Rand mining district is known for its deep gold mines and the associated high levels of seismic activity. Thousands of tremors are recorded every day by geophones installed in the mine workings. These events range in total magnitude ML from -1 to 4. Some of the biggest events (ML>3) are external to the network deployed on a single mine. Researchers combine data from three mines (Savuke, Tautona and Mponeng) to improve the location of these events. Source mechanisms were calculated by minimizing the L2 norm of the difference between the observed and predicted P, SV and SH spectral amplitudes, with visually assigned polarities. The preliminary results from the Savuka mine show that the major principal stress is compressional, oriented near to the vertical, and with a significant isotropic component in the moment tensor solution.enSeismicsFar West RandSouth AfricaMinesSource mechanismsTensor inversionWitwatersrand basinSavuka mineGeophysicsTautona mineMponeng mineConference PresentationKassa, B., Julia, J., Nyblade, A., & Durrheim, R. (2009). Source mechanisms of mining-related seismic events in the Far West Rand, South Africa. South African Geophysical Association. http://hdl.handle.net/10204/3684Kassa, BB, J Julia, AA Nyblade, and RJ Durrheim. "Source mechanisms of mining-related seismic events in the Far West Rand, South Africa." (2009): http://hdl.handle.net/10204/3684Kassa B, Julia J, Nyblade A, Durrheim R, Source mechanisms of mining-related seismic events in the Far West Rand, South Africa; South African Geophysical Association; 2009. http://hdl.handle.net/10204/3684 .TY - Conference Presentation AU - Kassa, BB AU - Julia, J AU - Nyblade, AA AU - Durrheim, RJ AB - The Far West Rand mining district is known for its deep gold mines and the associated high levels of seismic activity. Thousands of tremors are recorded every day by geophones installed in the mine workings. These events range in total magnitude ML from -1 to 4. Some of the biggest events (ML>3) are external to the network deployed on a single mine. Researchers combine data from three mines (Savuke, Tautona and Mponeng) to improve the location of these events. Source mechanisms were calculated by minimizing the L2 norm of the difference between the observed and predicted P, SV and SH spectral amplitudes, with visually assigned polarities. The preliminary results from the Savuka mine show that the major principal stress is compressional, oriented near to the vertical, and with a significant isotropic component in the moment tensor solution. DA - 2009-09 DB - ResearchSpace DP - CSIR KW - Seismics KW - Far West Rand KW - South Africa KW - Mines KW - Source mechanisms KW - Tensor inversion KW - Witwatersrand basin KW - Savuka mine KW - Geophysics KW - Tautona mine KW - Mponeng mine LK - https://researchspace.csir.co.za PY - 2009 SM - 9780620446020 T1 - Source mechanisms of mining-related seismic events in the Far West Rand, South Africa TI - Source mechanisms of mining-related seismic events in the Far West Rand, South Africa UR - http://hdl.handle.net/10204/3684 ER -