On possible causes of increase in seismic activity of mine fields in the Oktyabrsky and Taimyrsky mines of the Norilsk deposit in 2003. Part I: Seismic regime
(1) Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia;(2) Mining-Metallurgical Experimental Research Center (MMERC), Norilsk Nikel Joint-Stock Company, Norilsk, Russia