Similar to earthquakes, the Moon experiences shallow moonquakes, some caused by Earth’s gravitational pull, detected by Apollo mission seismometers.
Apollo mission seismometers detected thousands of moonquakes from 1969 to 1977.
Among these, shallow moonquakes occur at depths of around 10 kilometers or more below the surface, and some can be as strong as magnitude 5.5.
These shallow moonquakes are thought to be related to faults on the lunar surface and ongoing tectonic activity caused in part by the Moon's interior cooling and shrinking.
Additionally, some deep moonquakes occur hundreds of kilometers beneath the surface and are linked to Earth's gravitational pull (tidal forces) on the Moon's interior.