In the 1970s, two types of seismometers were installed on the Moon – Long-Period (LP) and Short-Period (SP). While LP data already revealed over 13,000 seismic events, most of the SP data remained unanalyzed due to noise. A recent study analyzed the SP data, uncovering 22,000 new seismic events, including thermal moonquakes and shallow moonquakes. This resulted in the discovery of nearly three times more tectonic events than previously thought. Surprisingly, the Apollo 15 site was found to be more seismically active. These findings challenge traditional beliefs about lunar seismicity, suggesting we may have underestimated the Moon’s seismic activity.
https://essopenarchive.org/users/527743/articles/673415-new-views-of-lunar-seismicity-brought-by-analysis-of-newly-discovered-moonquakes-in-apollo-short-period-seismic-data