I think quakes last noticeably longer than impacts, at least if they are large enough. On Earth, there's a fairly well-established empirical correlation[1]. Put

I think quakes last noticeably longer than impacts, at least if they are large enough. On Earth, there's a fairly well-established empirical correlation[1]. Putting a magnitude of 5.5 into the formula given here suggests a duration of about 70s, if that relationship holds on the Moon. [1]https://en.wikipedia.org/wiki/Earthquake_duration_magnitude https://en.wikipedia.org/wiki/Earthquake_duration_magnitude