Low-Magnitude Seismicity Monitoring in Rocks
A. N. BESEDINA1,2, N. V. KABYCHENKO1, G. G. KOCHARYAN1,2
1Institute of Geosphere Dynamics, Russian Academy of Sciences, Leninskii pr. 38, Bld. 1, Moscow, 119334 Russia
2Moscow Physico-Technical Institute, Institutskii per. 9, Dolgoprudny, 141700 Russia
Keywords: seismic monitoring, induced seismicity, seismic moment, seismic energy, stiffness
Abstract
The authors calculate possible errors in characterization of low-magnitude seismicity sources using the Brune model and methods of seismic event energy class and local magnitude definition. The adequacy of the model has been proved by comparing its results with the recordings of seismic vibrations in the North Ural Bauxite Mine. The errors due to the drastic distortion of emission spectrum become significant at the distance of 1000 m from the emission source and grow as the distance increases. Cases of great deviations from the similarity law are analyzed based on actual seismic monitoring in the North Ural Bauxite Mine, in mines in Poland, Finland and Canada, as well as in water basins. It is shown that phenomena due to physical difference of various size fracturing dynamics do not radically change seismic source capacity. Other causes, due to instrumentation shortcomings or incorrect data interpretation, may result in overestimated seismic energy and scaling-up of low-magnitude seismic events.
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