https://www.theregister.co.uk/2019/05/14/moon_shrinking_earthquake/

Our Moon is getting cooler, causing it to shrink. Now, research published in Nature Geoscience on Monday suggests that shrinkage is leading to a whole lot of shaking going on, with a little help from Earth too.

A team of geologists believe these cliff-like features are evidence of lunar tectonic activity. They analyzed seismic data taken from 28 moonquakes recorded during 1969 and 1977 during the Apollo missions with a type of algorithm known as a sparse seismic network.