TIME CHANGES IN DOMINANT TRENDS OF EPICENTRE MIGRATION FOR LOCAL SEISMICITY FROM A MINE

摘要

Time variations of trends of epicentre migration for a local seismicity induced by mining operations at Wujek coal mine in Poland were studied. We investigated whether these variations are non-random and reflect time changes of the factors controlling seismic events generation. The trends of epicentre migration are described by the distribution of deflection, that is, the azimuth of straight line connecting epicentres of every two consecutive events in a seismic series.