moonquake

astronomy

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In earthquake: Extraterrestrial seismic phenomena
…detected between 600 and 3,000 moonquakes during each year of their operation, though most of these seismic events were very small. The ground noise on the lunar surface is low compared with that of the Earth, so that the seismographs could be operated at very high magnifications. Because there was…
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In Moon: Internal activity of the past and present
Many of the moonquakes detected seem to be only small “creaks” during the Moon’s continual adjustment to gravity gradients in its eccentric orbit, while others are caused by meteorite impacts or thermal effects. Quakes of truly tectonic origin seem to be uncommon. The small quakes that do occur…
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