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Time changes in dominant trends of epicentre migration for local seismicity from a mine

Kustowski B.

Acta Geophysica Polonica

2000

Vol. 48, nr 4

455-464

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 epicenters of every two consecutive events in a seismic series. The probability density function of deflection, estimated by the nonparametric kernel method, indicates the multidirectionality of migration. Moreover, the dominant directions change systematically with time in a certain correlation with strong event occurrences.