Abstract

The authors analyze mine logs of seismic events in Poland, Finland, Canada, Russia and South Africa. For the analyzed events, induced seismic energy varies by 2–3 orders of magnitude at the same value of seismic moment. The upper and lower limits of the range correspond to “stiff” and “soft” sources, respectively. The most probable cause of the wide spread of the reduced energy values seems to be fluctuating properties of discontinuities due to the change in the composition of filler and water content of joints.

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