Velocity structure of the shallow lunar crust

Details Velocity structure of the shallow lunar crust Velocity structure of the shallow lunar crust

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979m%26p....20..439g&link_type=abstract

Moon and the Planets, vol. 20, June 1979, p. 439-468.

Computer Science

Least Squares Method, Lunar Crust, Lunar Seismographs, Seismology, Data Acquisition, Graphs (Charts), Lunar Geology, Seismograms, Signal To Noise Ratios

Scientific paper

Data from the thumper shots of the Apollo 14 and Apollo 16 active seismic experiments, testing whether the velocity variation in the shallow lunar crust (depths less than or equal to 10 m) can be represented by a self-compacting-power-layer or by a constant-velocity-layer model, are analyzed. Although filtering and stacking improved the S/N ratios, it was found that measuring the arrival times or amplitudes of arrivals beyond 32 m was not possible. The data quality precluded a definitive distinction between the power-law velocity variation and the layered-velocity model. Furthermore, it was found that the shallow lunar regolith is made up of fine particles, which supports the idea of a 1/6 power-velocity model. Analysis of the amplitudes of first arrivals revealed large errors in the data due to variations in the geophone sensitivities and shot strengths; a least-squares method, that uses data redundancy was employed to eliminate them.

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