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The Pekeris theory of normal mode propagation of explosion sound in two liquid layers is extended to include the case of a solid bottom. Curves giving phase velocity, group velocity, amplitude, vertical pressure distribution as a function of frequency are presented. The relative merits of geophones and hydrophones for underwater seismology and the best depth for each type of instrument are discussed in the light of the theory. The characteristics of an incoming signal are described.

PROPAGATION OF EXPLOSIVE SOUND IN A LIQUID LAYER OVERLYING A SEMI‐INFINITE ELASTIC SOLID