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Asymmetric propagation of surface waves on the aspherical Earth
Author(s) -
Tsuboi S.
Publication year - 1990
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl017i006p00665
Subject(s) - seismogram , amplitude , great circle , rayleigh wave , surface wave , phase (matter) , wave propagation , phase velocity , geology , geophysics , surface (topology) , physics , microseism , wave packet , love wave , seismic wave , geodesy , seismology , optics , geometry , mechanical wave , longitudinal wave , mathematics , quantum mechanics , astronomy
We investigate anomalies of both the phase velocity and the amplitude of surface wave that depend on the direction traversed along the great circle. Pairs of observed Rayleigh wave packets are convolved to show that the great circle phase velocity may depend on the propagation direction. We calculate synthetic seismograms using the eigensolutions obtained by the variational method to see if these anomalies are reproduced by present laterally heterogeneous earth models. The results show that present models can reproduce these anomalies qualitatively.