The Moon was geologically active between 3.7 and 2.5 billion years ago, experiencing quakes, volcanic eruptions, and outgassing.
Thermal Moonquake Characterization and Cataloging Using Frequency-Based Algorithms and Stochastic Gradient DescentUnlike tidal flexing in the Moon's interior, moonquakes result from temperature changes in the lunar crust . The airless environment on the Moon essentially means that heat from the Sun is not retained, nor does sunlight lead to the gradual warming of the surface.
Their analysis showed that thermal quakes occur with precise regularity every afternoon as the Sun leaves its peak position in the sky and the surface begins to cool rapidly. The researchers were able to triangulate the source of the activity and found that the morning tremors were coming a few hundred meters away from seismometers – from the Apollo 17 lunar lander itself!
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