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Bulletin of the Seismological Society of America; August 1968; v. 58; no. 4; p. 1293-1303
© 1968 Seismological Society of America
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Estimation of PcP travel times and the depth to the core

JAMES TAGGART and E. R. ENGDAHL

EARTH SCIENCES LABORATORIESESSA, RESEARCH LABORATORIES, BOULDER, COLORADO 80302
U. S. COAST AND GEODETIC SURVEY ENVIRONMENTAL SCIENCE SERVICES ADMINISTRATION, ROCKVILLE, MARYLAND 20852

Abstract

Based on a new P velocity distribution and observed PcP travel times from nuclear explosions, the core is estimated to have a mean radius = 3477 ± 2.0 km (depth = 2894 ± 2.0 km). Five velocity models were tested for the lower-most 90 km of the mantle. The PcP data suggest that the P velocity increases slightly with depth in this region. Tables of PcP travel times have been computed for the preferred model and a core radius of 3477 km.




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