[SunkenCiv]

Thanks oxcart.

At a depth of about 609 kilometers (378 miles), the intense pressure on the fault should inhibit the kind of rupture that took place. "It's a mystery how these earthquakes happen. How can rock slide against rock so fast while squeezed by the pressure from 610 kilometers of overlying rock?" said Thorne Lay, professor of Earth and planetary sciences at the University of California, Santa Cruz.

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[BenLurkin]

How can rock slide against rock so fast while squeezed by the pressure from 610 kilometers of overlying rock?"

I don't know. But I bet it makes for a big earthquake.