The Passive Seismic Experiment Package was a scientific experiment deployed on the lunar surface by the astronauts of Apollo 11 as part of the Early Apollo Surface Experiments Package. The experiment'
The Passive Seismic Experiment Package on the Moon
William Maurice "Doc" Ewing was an American geophysicist and oceanographer.
Ewing in 1972
The seismometer readings from the impact made by the Apollo 17 Saturn S-IVB stage when it struck the lunar surface are viewed in the ALSEP room in the Mission Control Center at Houston by Maurice Ewing, 1972