The present investigation is a continuation of the Suffield Experimental Station seismic program concerned primarily with a study of the propagation characteristics of the large-amplitude seismic waves in the vicinity of multiton, unconfined, chemical explosions, with the identification of the significant components of these waves, and with a determination of the source mechanism. Theoretical Rayleigh and Love wave dispersion curves are compared with the experimental data: for Rayleigh waves an additional criterion is used, namely the surface particle motion.The results indicate that: (1) the propagation characteristics of these large-amplitude surface waves are strongly influenced by the multilayering of unconsolidated sediments (several hundred feet thick) that overlie sedimentary rocks; (2) the two main components of the surface wave for which the ground motion is in the radial-vertical plane are of the types previously predicted; the former component, a constant-frequency wave train, is commonly referred to as an air-coupled Rayleigh wave; and (3) the major part of the energy of these surface waves is confined to the period range 0.2 to 1.0 second.

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