... Credit Copyright: Neil Armstrong , Apollo 11 Crew , GRIN , NASA Explanation: Why are there so many moonquakes? A recent reanalysis of seismometers left on the moon by the Apollo moon landings has revealed a surprising number of moonquakes occurring within 30 kilometers of the surface. ... Pictured above in 1969, Apollo 11 astronaut Buzz Aldrin stands besides a recently deployed lunar seismometer , looking back toward the lunar landing module . ... Publications with keywords: Moon - Apollo 11 . ...