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Moon’s tidal stress likely responsible for causing deep moonquakes, new study confirms

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The same gravitational force responsible for creating tides on Earth could be causing deep quakes on the moon, a new study confirms.

A new analysis of data gathered by the Apollo missions confirms that tidal stress – the gravitational pull of the moon on the Earth and of the Earth on the moon – is responsible for causing deep moonquakes, the lunar equivalent of earthquakes.

Seismometers placed on the moon during the Apollo 12, 14, 15 and 16 missions revealed the moon experiences deep moonquakes about 800 to 1,200 kilometers (497 to 746 miles) below its surface roughly every 27 days. Since this is about the time it takes the moon to make a complete circuit around Earth, scientists suspected the moonquakes were a result of tidal stress, but their exact cause remained a source of debate…more