On: “RECENT TECHNIQUES FOR DETERMINATION OF IN SITU ELASTIC PROPERTIES AND MEASUREMENT OF MOTION AMPLIFICATION IN LAYERED MEDIA,” BY R. J. SWAIN (GEOPHYSICS, APRIL, 1962, PP. 237–241).

Abstract

Swain points out that seismic techniques have been used for determination of elastic parameters in unconsolidated materials as well as in consolidated ones. It must be pointed out that relationships between elastic moduli and longitudinal and shear velocities are not entirely valid for soil or other unconsolidated matter, as those are not truly elastic. An exception to this statement may be made with a small error when it is desirable to determine the dynamic elastic properties of the material at the frequency of the seismic wave. Such a determination might be useful in testing a foundation for a vibrating machinery or a runway.