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2 Acta Geophysica Polonica

2 2004

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Seismic events and rotation waves in the Hans Glacier, Spitsbergen, and the Pasterze Glacier, Austria

Teisseyre K., Górski M., Suchcicki J.

Acta Geophysica Polonica

2004

Vol. 52, nr 4

465-476

Methods of recording and data analysis that jointly allow to estimate rotation components in the seismic field were applied at two glaciers: the Hans Glacier in the Spitsbergen archipelago behind the North Polar Circle and the Pasterze Glacier in the Austrian Alps. A substantial content of rotation velocity components was found in the data collected at both locations; especially high rotation amplitudes were found in the Hans Glacier. Differences between the results obtained from these two glaciers are shown and briefly discussed.

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.