Introduction : scope of the book -- Polish Polar Station in Hornsund, Spitbergen -- Seismological measurements : icequakes and icevibrations -- Seismic wave velocities in the Hans Glacier, Spitsbergen -- Spatial distribution of icequakes in the Hans Glacier -- Spectral analysis and source parameters of icequakes -- Predominant frequencies in spectra of ice vibration events -- Application of the shear-band model to the determination of focal parameters