ABYSSALLY GENERATED T PHASES
Technical summary rept.
HAWAII UNIV HONOLULU INST OF GEOPHYSICS
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Two distinct types of signals have been identified from studies of T- phase spectra and source locations. One, with its source at a shoaling slope of the ocean bottom and with dominant frequencies near 4 cps, is the previously recognized and described classic T phase. The other, with its source in deep water and with dominant frequencies near 30 cps, is newly identified and is here termed the abyssally generated, or abyssal, T phase. Scattering from the sea surface is proposed as a mechanism for producing rays which propagate through the ocean with an apparent velocity equal to sofar velocity. The sea surface roughness is hypothesized as shaping the spectrum of the abyssal T phase. A synthesis of the power-level record is derived which relates the degree of sharpness of the abyssal T-phase peak with focal depth.