
This was taken with a “tuned” Sputnik, along Lake Superior on Minnesota’s “North Shore” a few years back. Although Lake Superior does not freeze over entirely in winter (unlike smaller bodies of water with less wave action), there are typically areas in protected bays that will freeze over for a time. These ice sheets then “break up” periodically and the ice plates pile up near the shore, as seen here. The sound during the breakup is incredible, although I have not had a chance to observe in recent years. Hearing the sounds prior to the breakup when the water motion causes a sort of “belching” under the ice is also quite an experience.