The Apollo passive seismic experiment

Physics – Geophysics

Scientific paper

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Apollo Lunar Surface Experiments Package, Lunar Seismographs, Moonquakes, Seismic Energy, Lunar Crust, Lunar Geology, Lunar Mantle, Lunar Tides, Meteoroids

Scientific paper

The completed data set obtained from the 4-station Apollo seismic network includes signals from approximately 11,800 events of various types. Four data sets for use by other investigators, through the NSSDC, are in preparation. Some refinement of the lunar model based on seismic data can be expected, but its gross features remain as presented two years ago. The existence of a small, molten core remains dependent upon the analysis of signals from a single, far-side impact. Analysis of secondary arrivals from other sources may eventually resolve this issue, as well as continued refinement of the magnetic field measurements. Evidence of considerable lateral heterogeneity within the moon continues to build. The mystery of the much meteoroid flux estimate derived from lunar seismic measurements, as compared with earth-based estimates, remains; although, significant correlations between terrestrial and lunar observations are beginning to emerge.

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