Internal friction Q factor measurements in lunar rocks

Details Internal friction Q factor measurements in lunar rocks Internal friction Q factor measurements in lunar rocks

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rock.rept.....t&link_type=abstract

Annual Report, 1 Feb. - 31 Dec. 1976 Rockwell International Science Center, Thousand Oaks, CA.

Physics

Internal Friction, Lunar Geology, Lunar Rocks, Q Factors, Attenuation, Basalt, Damping, Outgassing, Seismic Waves, Selenology

Scientific paper

Investigations to aid in the interpretation of seismic data obtained below the lunar surface are reported. Fine grained basalt with about 1.0% open core porosity was encapsulated under hard vacuum and measured. A Q value just under 2,000 at 0.5 kbar was achieved for a terrestrial analog of lunar basalt. In contrast to the modulus which increases by as much as 10%, the quality factor Q shows little or no change with pressure (a well outgassed sample maintains a high Q, whereas one exposed to laboratory atmosphere maintains a low Q). This result suggests that the absence of volatiles plays an important role in determining the q factor even at a depth of 10 km below the lunar surface.

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