Physics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1575u&link_type=abstract
Geophysical Research Letters (ISSN 0094-8534), vol. 19, no. 15, Aug. 3, 1992, p. 1575-1578.
Physics
7
Love Waves, Propagation Modes, Rayleigh Waves, Seismograms, Wave Propagation, Coupled Modes, Periodic Variations, Perturbation Theory, Phase Velocity, Surface Waves
Scientific paper
In addition to the Fermat phase anomaly and the amplitude anomaly produced by geometric focusing and defocusing along the propagation path, long-period surface waves on a laterally heterogeneous earth exhibit phase and amplitude variations due to the deviation in takeoff azimuth of the ray at the source. The resulting perturbation in source phase is generally small enough to be ignored; however, the source amplitude anomaly may be comparable to that produced by focusing and defocusing. Adding the source anomaly significantly reduces the variance of amplitude measurements performed on a large suite of synthetic vertical-component coupled-mode seismograms. Future tomographic analyses that incorporate amplitude measurements should account for this effect.
Dahlen F. A.
Um Junho
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