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Bulletin of the Seismological Society of America; June 1973; v. 63; no. 3; p. 1013-1023
© 1973 Seismological Society of America
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A variational method for love waves in nonhorizontally layered structures

B. GJEVIK

INSTITUTE OF GEOPHYSICS AND PLANETARY PHYSICS UNIVERSITY OF CALIFORNIA, LA JOLLA, CALIFORNIA 92037

Abstract

A variational principle for Love waves propagating in a layer with varying thickness overlying a half-space is formulated. By an averaging procedure, the wave modulation due to gradual variation of the thickness of the upper layer is found. The case of long-period Love waves is particularly examined and the wave number and amplitude modulation both for a monochromatic wave and for a transient wave train due to an impulsive source are determined. Moreover, the travel time for a certain phase in the wave train is determined. It is found that for well-dispersed wave trains the travel time is given by the phase velocity corresponding to the mean depth of the upper layer.






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