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Um & Dahlen 1992
Um, J. and Dahlen, F.A. (1992). Source phase and amplitude anomalies of long-period surface waves. Geophysical Research Letters 19: doi: 10.1029/92GL01391. issn: 0094-8276.

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 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 analysis that incorporate amplitude measurements should account for this effect. ¿ American Geophysical Union 1992

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Abstract

Keywords
Seismology, Surface waves and free oscillations, Seismology, Structure of mantle and core, Seismology, Structure of the lithosphere and upper mantle, Seismology, General or miscellaneous
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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