Phase velocities of Rayleigh waves in the period range of 18 to 60 sec were determined between the seismograph stations at Golden, Colorado, and Albuquerque, New Mexico. The average phase velocity for the 50-sec waves is significantly below the average continental value of 4.0 ± 0.1 km/sec. However, the observed and theoretical values of phase velocity are in good agreement with a three-layer crustal model 59 km thick, similar to the one proposed by Smith (1962).

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