Source Mechanisms of Mine-related Seismicity, Savukamine, South Africa.

摘要

We report full moment tensor solutions for 76 mine tremors with moment magnitudes (Mw between 0.5 and 2.6 recorded by a network of 20 high-frequency geophones in a deep gold mine in South Africa. Source mechanisms convey important information on how in-mine stresses are relaxed, and understanding the nature of such mechanisms in essential for improving our assessment of rock mass-response to mining. Our approach has consisted of minimizing the L2 norm of the difference between observed and predicted P, SV, and SH spectral amplitudes, with visually assigned polarities, to constrain all six independent components of the seismic moment tensor. Or results reveal the largest principal stresses in the mine are compressive, oriented near-vertically, and relaxed through a mix of volumetric closure and normal faulting, consistent with a gravity- driven closure of the mined-our areas. Previous moment tensor studies in deep mines has suggested that the distribution of seismic sources in terms of the voumetric-shear mix was bimodal. A biomodal distribution is compatible with our moment tensor solutions only for moment magnitudes above 2.2. Events in the 0.5< Mw < moment magnitude range display a constinuous distribution of their volumetric-shear mix.