By Renata Dmowska (ed.), Barry Saltzman (ed.)
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Simple barrier/asperity models are proposed by Kuhnt et al. (1989) to interpret the source parameters of low stress drop seismic events induced by room and pillar mining in a deep mine and directly associated with a stope area. In the barrier model the crack begins at the stope and propagates toward the caving zone. The pillars act as barriers with higher strength, and the crack is stopped without breaking the pillars. In the asperity model pillars act as stress concentrators, and with increasing stress level the pillar asperities are broken.
SEISMIC SOURCEMODELING Seismic radiation can be calculated using either the dislocation or the crack approach. In the dislocation approach the earthquake is represented in terms of a slip function on the fault plane; its form is generally chosen intuitively, without rigorous analysis of the time-dependent stresses acting in the area. , Gibowicz, 1986). The various kinematic dislocation solutions can be classified according to the model dimensions, the characteristics of earth structure, the type of dislocation, the various methods of solution, and according to the range of considered rupture velocities and the type of slip function used (Luco and Anderson, 1983).
Data are plotted by source regions: CA-Cahuilla (+); HS-Hot Springs ( 0 ) ;BR-Buck Ridge (A);TBTable Mountain (0); AN-Anza (0). , 1988). 4 MPa. It was found that the corner frequency is independent of the seismic moment for events with seismic moment smaller than about 5 x lo5 N m. , 1990). The idea of a characteristic earthquake advocated by Aki (1984), in which asperities and barriers along the fault are considered as its physical basis, was adopted to the notion of a characteristic mine tremor of the barrier type (Takeo, 1983; Aki, 1984),in which the slip varies by more than one order of magnitude, whereas the length of the fault is stable.
Advances in Geophysics, Vol. 32 by Renata Dmowska (ed.), Barry Saltzman (ed.)