Instruments similar to this Passive Seismic Experiment Array were deployed as components of the Apollo Lunar Surface Experiment Packages (ALSEPs) deployed on Apollo 11, 12, 14, 15, and 16. This particular unit was built for Apollo 17, though it was not flown. The experiment was designed to detect vibrations on the lunar surface in the vertical and two horizontal directions. The seismometers were used to determine the structure of the moon's interior, the nature of meteoroid strikes, tidal shifts in the lunar surface, and changes in the moon's gravitational field. Like other ALSEP experiments, this experiment was powered by a Radioisotope Thermoelectric Generator (RTG).
This unit was stored by Bendix Aerospace until NASA transferred the object to the Smithsonian in 1982.
Transferred from the NASA - Johnson Space Center