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start:physics:general:squeaky_sand

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Squeaky Sand

Sand on some beaches and dunes emits a distinct 'squeaking' sound when moved under pressure.

videos here
It only affects certain types of sand - more rounded and drier grains generally don't squeak (as much).
The underlying acoustic mechanism as yet undiscovered.

More info from ABC, AUS

“We can land a remote controlled robot on Mars but we don’t know why sand squeaks here on Earth and to be honest I kinda like that.”

A list of locations where squeaking sands can be found is maintained by the Acoustic Engineering dept. at the University of Salford, UK.

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