Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...47..253j&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 47, p. 253-266.
Physics
3
Scientific paper
Departures from the classical approximations of geometrical optics and great circle propagation are investigated by surface wave ray-tracing on laterally heterogeneous models and computation of synthetic seismograms by the Gaussian beam method. Higher order deviations, such as time differences between odd and even orbits, residuals from great-circle average times, and fluctuations in the succession of eigenfrequencies in the spectra are sought for and compared with long-period great-circle observations. In the case of the Akita-Oki (Honshu) earthquake (1983) at the Geoscope station PAF, the deviations are of the order of the first order tomographic effect. They are interpreted by a transverse velocity gradient shifting the orbits. In other examples where great-circle propagation is nearly satisfied, geometrical effects of curvature are displayed. Frequency fluctuations due to lateral heterogeneity appear in the synthetic spectrum.
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