Moonquakes Surprisingly Common
The Apollo moon landings left seisometers on the moon, which have recently revealed a shocking number of moonquakes! These moonquakes are occurring within only 30 kilometers of the moon's surface. Between 1972 and 1977, 28 moonquakes were recorded. Not only are there several moonquakes, they are surprisingly long: longer than Earth's soft rock Earthquakes. The stiff rock causes the moon to vibrate for several minutes, and they are strong enough to move furniture. The only hypothesis of these moonquakes are that landslides cause the vibrations.
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