Seismic Q of the lunar upper mantle

Details Seismic Q of the lunar upper mantle Seismic Q of the lunar upper mantle

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.4855n&link_type=abstract

Journal of Geophysical Research, vol. 87, June 10, 1982, p. 4855-4861.

Other

25

Lunar Mantle, Moonquakes, Q Values, Seismic Waves, Compression Waves, Energy Dissipation, Lunar Seismographs, S Waves, Moon, Mantle, Seismicity, Seismic Q, P Waves, S Waves, Frequencies, Procedure, Shear, Compression, Heat, Data, Moonquakes, Seismograms, Spectra, Power, Dissipation

Scientific paper

Shallow moonquake data are used to determine the frequency dependence of Q values for both compressional and shear waves in the upper mantle of the moon at frequencies between 3 and 8 Hz. The seismic P wave Q is estimated to be at least 4000 and is nearly independent of frequency or decreases slightly with increasing frequency, while the S wave Q increases from at least 4000 at 3 Hz to at least 7000 at 8 Hz. The rate of increase of Q(S) is approximately proportional to the 0.7 + or - 0.1 power of the frequency above 5 Hz. With the absence of other dissipation mechanisms, compressional heat loss may be a dominant factor in the lunar interior. Uncertainty remains, however, in the absolute values of Q's owing to the largely unknown detailed structure of the lunar upper mantle.

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