Abstract

Experiments involving phase-velocity change determination by means of continuous waves in a solid medium with boundaries can be designed and operated to avoid difficulties due to component non-stationarity or to presence of several wave modes. Site, gauge, and transmitter geometry have great effect on the radiation and propagation of body and surface waves and may be chosen to avoid unwanted modes within the gauge length. Technique for determination of velocities of the wave modes within the gauge length, which implies the ability to identify those wave modes which are present, is described.

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