Abstract:
A preliminary investigation was done into the possible causes of the increased seismic activity in the Witwatersrand
Basin. The paper focuses on approximated underground mining areas, groundwater mobility, rock types and the
proximity of fault lines to seismic events. These parameters were mapped and correlated with observed seismicity in the
area. There is some indication that the presence of underground mining areas has a positive relationship with the
occurrence of seismic events. The other parameters exhibit a negative relationship with seismic activity. However, more
detailed investigations are required before final conclusions can be drawn. An approach to risk assessment of possible
earthquake scenarios in the City of Johannesburg (CoJ) is proposed. The approach aims to assess potential damage to
infrastructure and loss of life in the case of an earthquake. The results of such an assessment may provide justification
for more detailed investigations.
