Some moonquakes and Apollo-era impacts produced seismic signals that lasted for hours, much longer than the strongest shaking people usually notice from an earthquake on Earth. The Moon’s dry, heavily fractured interior scatters and damps seismic energy differently, so waves can reverberate instead of fading quickly. Duration depends on the type and strength of the event; not every moonquake lasts for hours.
What does ‘last longer’ mean?
A seismometer records ground motion, not the event’s full cause. The initial rupture or impact may be brief while the vibrations it sets off continue afterwards. NASA’s Apollo instruments recorded lunar seismic signals that could persist for a long time; NASA describes shallow moonquakes lasting at least ten minutes, and some impact signals lasting much longer. [1]
So a long signal does not mean the Moon is continuously cracking for hours. It means the ground continues to vibrate after the source has stopped.
Why lunar vibrations fade differently
Earth’s crust contains water, weathered material, sediments and many interfaces that absorb or scatter seismic energy. The Moon is much drier and more fractured. That structure can let seismic waves bounce around and lose energy relatively slowly. NASA notes that Apollo impact signals lasted much longer than comparable events on Earth. [2]
The Moon’s lower gravity and different internal structure also shape seismic waves, but ‘no water’ is not a complete single-cause explanation. Scientists infer the interior from limited seismic stations and models, so details remain an active research subject.
Different moonquakes have different causes
Apollo instruments detected deep moonquakes linked to tidal stresses, shallow events, thermal quakes caused by the extreme lunar day–night cycle, and vibrations from impacts. These are not all the same kind of event. [1]
A long-lasting lunar signal matters for future surface missions because equipment and habitats must tolerate prolonged shaking. For the broader question of where lunar tremors come from, see what causes moonquakes.
Sources and evidence
- NASA Science — Moonquakes ↗
Types, depths and durations of measured moonquakes.
- NASA Science — Apollo samples and LRO help forecast moonquakes ↗
Comparison of lunar shaking with earthquakes and implications for missions.
Sources consulted: 11 October 2026. Written with AI assistance and checked against the linked references; not independently reviewed by a subject specialist. Sources do not endorse this article. See our editorial policy.
Revision: Original explanatory article prepared from linked scientific and institutional sources; scope and uncertainty are stated in the text.