Earthquakes are driven by energy stored up in rocks over millennia—energy that, once released, we perceive mainly in the form of the ground’s shaking. But a quake also generates a flash of heat and fractures and damages underground rocks. And exactly how much energy goes into each of these three processes is exceedingly difficult to measure in the field.
Now, with the help of carefully controlled miniature “lab quakes,” MIT geophysicist Matěj Peč and colleagues have quantified this so-called…

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