Physics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1489p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Sept. 1990, p. 1489-1492.
Physics
5
Free Vibration, Seismic Waves, Surface Waves, Wave Scattering, Earth Rotation, Earthquakes, Geodynamics, Transverse Oscillation
Scientific paper
On a rotating, aspherical earth, coupling between spheroidal and toroidal seismic free oscillations is manifested in the time domain as a slow alternation of the oscillation envelope between the transverse and the radial and/or vertical motion components. Using a narrow-band smooth envelope estimator, this behavior has been seen in data from the M(s) = 8.1 Macquarie Ridge earthquake of May 23, 1989. Rotational coupling is the principal cause of mixed-type coupling for f less than 4.2 mHz. However, envelope perturbations consistent with mixed-type coupling are observed for (0)S(38)-(0)T(36) and (0)S(37)-(0)T(35), which do not couple through rotation, and couple only weakly through smooth upper mantle velocity models. Such envelope perturbations can bias estimates of modal Q, and suggest that scattering may play a role in the attention of long-period surface waves.
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