Apollo 12 Seismic Signal: Indication of a Deep Layer of Powder

Details Apollo 12 Seismic Signal: Indication of a Deep Layer of Powder Apollo 12 Seismic Signal: Indication of a Deep Layer of Powder

Sep 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...169.1071g&link_type=abstract

Science, Volume 169, Issue 3950, pp. 1071-1075

Computer Science

Sound

12

Scientific paper

The seismic signal caused by the Apollo 12 lunar module is interpreted in terms of propagation between source and receiver through a layer of powder in which sound velocity increases with depth. This increase, which is due to compaction, extends over several kilometers and leads to a concentration of seismic waves toward the surface. Computer simulations with the use of ray acoustics and on the assumption of a randomly undulating lunar surface approximate well the observed signal. Seismic amplitudes are greatly enhanced in such a medium compared to solid rock, so that the observed signal requires less power to be transmitted than previously estimated.

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