Lunar rock Q in 3000-5000 range achieved in laboratory

Details Lunar rock Q in 3000-5000 range achieved in laboratory Lunar rock Q in 3000-5000 range achieved in laboratory

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rspta.285..475t&link_type=abstract

(Royal Society, Discussion on the Moon - A New Appraisal from Space Missions and Laboratory Analyses, London, England, June 9-12

Physics

7

Lunar Rocks, Moisture Content, Outgassing, Q Values, Seismology, Ultrahigh Vacuum, Vacuum Apparatus

Scientific paper

Q measurements carried out by the vibrating-bar technique on lunar sample 70215,85 have yielded Q values as high as 4800 at room temperature. The strong outgassing procedures necessary to raise the Q to these high values from Q of approximately 60 (when received) and studies of the effect on Q by a variety of different gases show that the removal of thin layers of adsorbed H2O is responsible for the dramatic increase in Q. Experiments carried out with a low-frequency apparatus on a terrestrial analog at 50 Hz suggest similar increases in Q with outgassing, thus providing evidence that dramatic effects on Q can be expected to occur down to seismic frequencies. These results, in part, explain the contrast between seismic data in the lunar and terrestrial crust in terms of the absence and presence, respectively, of adsorbed H2O.

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