Accession Number:
AD0649315
Title:
ABYSSALLY GENERATED T PHASES
Descriptive Note:
Technical summary rept.
Corporate Author:
HAWAII UNIV HONOLULU INST OF GEOPHYSICS
Personal Author(s):
Report Date:
1967-01-01
Pagination or Media Count:
29.0
Abstract:
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.
Descriptors:
Subject Categories:
- Seismology