Frozen lakes can sound like laser guns in the fall and spring, when cracks send sound waves bouncing through them. But they’re not the only singing landscapes you can find.
When cracks and fractures form in a sheet of ice , they release energy in the form of vibrations. Those vibrations cover a range of frequencies, from high to low. It’s similar to thewhich happens because sound waves bunch up as they approach you and spread apart as they move away. The closer the waves are to each other, the higher the pitch — and vice versa.
The difference between a song and a sound is simple, she explains. Sounds generally cover multiple frequencies. On a spectrogram, they “look like a bulge.” Songs, on the other hand, have distinct frequencies that repeat. Dragging a hand carelessly over a guitar at no particular pace creates a vague noise, for example, but plucking individual strings in repeating patterns creates harmony.
Schlindwein and her colleagues assumed the same mechanism would explain both phenomena: fluid pressure. Perhaps, in the case of the icebergs, this pressure came from water flowing through crevasses. Later research, however, revealed that the icebergs only sang when they had contact with the ground or with each other. Now, Schlindwein says, it appears more likely that the songs originate from tiny “earthquakes” produced when the icebergs make this contact.
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