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Bulletin of the Seismological Society of America; August 1968; v. 58; no. 4; p. 1339-1344
© 1968 Seismological Society of America
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Computational methods

ERIC R. ENGDAHL1, JAMES TAGGART2, JOHN L. LOBDELL3, E. P. ARNOLD4 and GERALD E. CLAWSON5

1 U.S. COAST AND GEODETIC SURVEY ENVIRONMENTAL SCIENCE SERVICES ADMINISTRATION, ROCKVILLE, MARYLAND 20852
2 EARTH SCIENCES LABORATORIES ENVIRONMENTAL SCIENCE SERVICES ADMINISTRATION, BOULDER, COLORADO 80302
3 DALLAS SEISMOLOGICAL OBSERVATORY SOUTHERN METHODIST UNIVERSITY, DALLAS, TEXAS 75222
4 INTERNATIONAL SEISMOLOGICAL RESEARCH CENTRE, EDINBURGH
5 GEOTECHNICAL CORPORATION DIVISION OF TELEDYNE CORPORATION, GARLAND, TEXAS 75040

Abstract

The surface-focus P travel times estimated by Herrin et al (1968) entail a P velocity distribution from which smoothed travel-time tables of P, pP, PP and PcP are constructed. Theoretical considerations and computational procedures used are described. It is shown that computational errors in the new travel-time tables are less than 0.01 second.

Footnotes

* Now with Geophysics Research Group, U.S. Coast and Geodetic Survey, Environmental Science Services Administration, Rockville, Maryland.




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