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Predominant frequencies in the spectrum of ice-vibration events

Górski M.

Acta Geophysica Polonica

2004

Vol. 52, nr 4

457-464

Examples of ice-vibrations recorded in the Hans Glacier (South Spitsbergen) in spring-summer 2002, and in the Pasterze Glacier (Alps) in the fall of 2003 have been analysed. The spectral analysis of the recorded vibrations reveals a relationship between the period of vibrations and the scale of dynamic processes in a given glacier. Predominant frequency of ice-vibrations recorded in the Pasterze Glacier is higher than that of the events in the Hans Glacier, where the scale of dynamic processes in much greater. The presented spectra of the ice-vibration seismic events display characteristic frequency maxima related to the scale of dynamic processes taking place within a given glacier.