Full and new moons seem to make the largest, most devastating earthquakes more likely. Although the effect is too small to make much difference in preparing for earthquakes in the short term, the discovery could one day provide insights into the ways that they develop and grow. During full and new moons, the sun. moon and Earth align, so gravity tugs more strongly on the planet's crustal plates. The resulting "Earth tides" and increased tidal movements in the oceans can add to the stresses on earthquake faults.
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