We analyse seismicity in deep South African gold mines. We find here the unique situation that it consists of both induced earthquakes and aftershocks triggered by the M5.5 Orkney earthquake. We conclude that the magnitude statistics of aftershocks and induced earthquakes are influenced by the size and geometry of the volume of stress perturbation. We also image the propagating rupture of the M5.5 earthquake. We conclude that it propagated unilaterally from North to South over a distance of 6km.
We analyse seismicity in deep South African gold mines. We find here the unique situation that it consists of both induced earthquakes and aftershocks triggered by the M5.5 Orkney earthquake. We conclude that the magnitude statistics of aftershocks and induced earthquakes are influenced by the size and geometry of the volume of stress perturbation. We also image the propagating rupture of the M5.5 earthquake. We conclude that it propagated unilaterally from North to South over a distance of 6km.
The hydraulic permeability of rocks characterizes fluid mobility. This quantity is important for various applications. Because of the high resolution and large penetration range of seismic waves as well as the ability of seismic exploration to operate from the Earth's surface, a seismic-reflection-based method for characterizing the underground permeability is of importance. Stress-dependent rock-physics experiments allow one to calibrate seismic data for estimating permeability.
The hydraulic permeability of rocks characterizes fluid mobility. This quantity is important for...