In his article “Seismic Waves from a Transducer at the Surface of Stratified Ground,” GEOPHYSICS, October 1956, p. 939, F. F. Evison makes the following statement concerning a paper written by Eugene Usdin and myself in GEO-PHYSICS, v. 18, No. 4, October 1953, p. 844 (Dispersive Properties of Stratified Elastic and Liquid Media: A Ray Theory); “The group velocity curve shown by Tolstoy and Usdin for the second mode appears to be in error.”

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