Geologists later determined that FU10 was not a simple fault slip, but a : deep water trapped in the porous, fractured slate acted as a lubricant, allowing two massive blocks of Paleozoic rock to creep past each other at the rate of snail's pace—about 2.5 mm per hour. The sound, heard by only a few sensitive ears, was a deep, infrasonic groan, akin to a cello string being bowed for centuries in a single note.
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