Die Schallplatten aus Eis hatte ich letztens erst. Der Komponist und Soundtüftler Andreas Bick hat etwas Ähnliches, wenn auch ganz anderes gemacht: Dispersion of Sound Waves in Ice Sheets. Dafür hat er hat den Sound aufgenommen, den gefrorene Seen von sich geben und diesen zusammen geschnitten. Fieldrecording in ganz kalt. Sehr interessant, was dabei an Klangmaterial heraus kam.
I made this sound recording of a frozen lake in the winter of 2005/06 in the area around Berlin. Frozen lakes are known to give off most noise during major fluctuations in temperature: the ice expands or contracts, and the resulting tension in the ice causes cracks to appear. Due to the changes in temperature, the hours of morning and evening are usually the best times to hear these sounds. In my experience, thin ice is especially interesting for acoustic phenomena; it is more elastic and sounds are propagated better across the surface. Snowfall, on the other hand, has a muffling effect and the sound can only travel to a limited extent. The ice sheet acts as a huge membrane across which the cracking and popping sounds spread. Underwater microphones proved especially well-suited for these recordings: in a small hole drilled close beneath the surface of the water, the sounds emitted by the body of ice carry particularly well. The most striking thing about these recordings is the synthetic-sounding descending tones caused by the phenomenon of the dispersion of sound waves. The high frequencies of the popping and cracking noises are transmitted faster by the ice than the deeper frequencies, which reach the listener with a time lag as glissandi sinking to almost bottomless depths.