HR: 1340h
AN: S43A-1056    [Abstracts]
TI: Cataloguing Seismic Waveform Properties Recorded With a 3D Network in a Gold Mine in South Africa
AU: * Julia, J
EM: jjulia@geosc.psu.edu
AF: Penn State University, Deike Bldg, University Park, PA 16802, United States
AU: Nyblade, A A
EM: andy@geosc.psu.edu
AF: Penn State University, Deike Bldg, University Park, PA 16802, United States
AU: Gok, R
EM: gok1@llnl.gov
AF: LLNL, 7000 East Ave., Livermore, CA 94550, United States
AU: Walter, W R
EM: walter5@llnl.gov
AF: LLNL, 7000 East Ave., Livermore, CA 94550, United States
AU: Linzer, L
EM: LLinzer@csir.co.za
AF: CSIR, POB 91230, Auckland Park, 2006, South Africa
AU: Durrheim, R J
EM: rdurrhei@csir.co.za
AF: CSIR, POB 91230, Auckland Park, 2006, South Africa
AU: Dirks, P
EM: dirksp@geosciences.wits.ac.za
AF: Witwatersrand University, Geosciences Bldg., Wits, 2050, South Africa
AB: The SAVUKA gold mine is located in the northwestern edge of the Witwatersrand basin, a Late Archean (3.07- 2.71~Ga) intracratonic basin in South Africa that hosts the largest known gold-uranium-pyrite ore deposits in the world. Seismic events related to the mine activity span several orders of magnitude through a variety of sources that include mine blasts, pillar collapses, and faulting events. These events are systematically recorded and catalogued through an in-mine, 3D seismic network consisting of 20, three-component, short-period stations with natural frequencies ranging between 4.5 and 28.0~Hz and deployed as deep as ~3.5 km. After 5 months of seismic monitoring of the mine, we have been able to assemble a database of over 6000 events spanning magnitudes in the -2.5 < M_L < 4.4 range. The potential of this unique data set for characterizing the detailed seismic properties of the basin and studying source properties of non-double couple events is explored through simple, first-pass analysis on the recorded waveforms. Moreover, the in-mine network is complemented by a small array of 4 broadband stations interspaced ~10~km apart on the surface of the mine, and by a number of AfricaArray stations in South Africa and neighboring countries located at regional distances (50- 1000~km) from the mine. The largest mine-induced events are clearly recorded at distances as far away from the mine as 450~km and provide a unique opportunity for studying the regional propagation of seismic phases as well as the structure of the cratonic crust underlying the basin.
DE: 7203 Body waves
DE: 7205 Continental crust (1219)
DE: 7215 Earthquake source observations (1240)
DE: 7219 Seismic monitoring and test-ban treaty verification
DE: 7294 Seismic instruments and networks (0935, 3025)
SC: Seismology [S]
MN: 2007 Fall Meeting