Lunar shear velocity structure at Apollo sites 12, 14, and 15

Details Lunar shear velocity structure at Apollo sites 12, 14, and 15 Lunar shear velocity structure at Apollo sites 12, 14, and 15

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4932m&link_type=abstract

Journal of Geophysical Research, vol. 80, Dec. 10, 1975, p. 4932-4938.

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Lunar Seismographs, Propagation Velocity, Rayleigh Waves, Shock Spectra, Surface Waves, Velocity Distribution, Apollo Lunar Surface Experiments Package, Lunar Surface, Meteorite Collisions, P Waves, S Waves, Shear Stress, Shock Wave Propagation, Vibrational Spectra

Scientific paper

Spectral amplitude ratios of horizontal-to-vertical motion produced on seismograms of meteoroid impacts at the Apollo 12, 14, and 15 sites, the Apollo 14 and 15 lunar-module impacts, and the Apollo 15 S4B impact show consistent differences among the recording sites. On the assumption that the motion represents predominantly fundamental-mode Reyleigh waves and that the compressional-wave velocity structure is similar to that derived in other investigations involving the Apollo seismic experiments, estimates are made of the shear-wave velocity structure under the three sites. Near-surface velocities are about 35 m/s at the three sites. The results for site 14 indicate an increase to about 100 m/s near the 8-m depth and to 200 m/s at the 38-m depth. Results for sites 12 and 15 show a smoother gradient and generally a greater velocity at a given depth than that indicated at site 14, reaching velocities of about 400 m/s near the 120-m depth. If the assumed P velocity structures are correct and if changes in S velocity coincide with changes in P velocity, then the ratio of these velocities decreases from 2.9 to 2.0 in the upper 19 meters at site 12, in the upper 38 meters at site 14, and in the upper 21 meters at site 15.

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