Variation in apparent attenuation of the earth's normal modes due to lateral heterogeneity

Details Variation in apparent attenuation of the earth's normal modes due to lateral heterogeneity Variation in apparent attenuation of the earth's normal modes due to lateral heterogeneity

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..141d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 12, March 1985, p. 141-144.

Physics

13

Heterogeneity, Seismic Waves, Wave Attenuation, Wave Interaction, Coriolis Effect, Earthquakes, Random Noise, Vibration Mode, Wave Diffraction

Scientific paper

Constructive and destructive interference of the singlets comprising a multiplet in the 3242 full first-order isolated normal mode multiplet synthetic seismograms presently studied can account for the noise-corrected variance of free oscillation attenuation measurements in the 3-4 mHz range. The interference yields a synthetic Q measurement distribution which is sensitive to a model's short wavelength velocity features. The Woodhouse and Dziewonski (1984) model M84A for the upper mantle velocity structure causes a scatter in the synthetics which is large enough to interfere with any signal from the lateral Q structure.

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