Physics – Geophysics
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978tamu.rept.....g&link_type=abstract
Final Report, 1 Feb. 1976 - 15 Mar. 1978 Texas A&M Univ., College Station. Dept. of Geophysics.
Physics
Geophysics
Lunar Seismographs, Mathematical Models, Velocity Measurement, Apollo 14 Flight, Apollo 16 Flight, Data Processing, Lunar Geology, Seismic Waves
Scientific paper
The data from the Apollo-14 and Apollo-16 Active Seismic Experiments were reanalyzed and show that a power-law velocity variation with depth is consistent with both the traveltimes and amplitudes of the first arrivals for source-to-geophone separations up to 32m. The data were improved by removing spurious glithches, flickering and stacking. While this improved the signal-to-noise ratios, it was not possible to measure the arrivals beyond 32m. The physical evidence that the shallow lunar regolith is made up of fine particles adds weight to the 1/6-power velocity model. The 1/6-power law predicts the traveltime t(x), varies with separation, x, as t(x) = t0 (x/x0) to the 5/6 power and, using a first-order theory, the amplitude, A(x), varies as A(x) = A0 (x/x0) to the (13-m)/12, M 1; the layer-velocity model predicts t(x) = t0 (x/xsub 0) and A(x) = A0 (x/x0) to the 2nd power.
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