A new study reveals the inner workings of tidally triggered earthquakes, and finds that even the slightest stress can set off a tremor. "It's the magma chamber breathing, expanding and contracting due to the tides, that's making the faults move," said Scholz, who co-led the study.

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A new study reveals the inner workings of tidally triggered earthquakes, and finds that even the slightest stress can set off a tremor. "It's the magma chamber breathing, expanding and contracting due to the tides, that's making the faults move," said Scholz, who co-led the study.