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Published December 1962 | Published
Journal Article Open

A reinterpretation of phase velocity data based on the gnome travel time curves


Significant lateral variations in upper mantle velocities across the western U. S. were observed in the GNOME experiment. This makes necessary a reinterpretation of crustal thickness measurements made with the assumption that velocities in the various layers of the crust remain constant while their thickness changes. Four examples of the work of Ewing and Press have been reinterpreted. The crust is thinner (30 km) in the Basin and Range Province and thicker (55 km) under the Rocky Mountains than indicated by previous interpretations.

Additional Information

Copyright © 1962, by the Seismological Society of America. Manuscript received June 30, 1962. We are grateful to John H. Healy of the U. S. Geological Survey (Crustal Studies Branch) for making available refraction data for the Nevada and New Mexico regions in advance of publication. This research was supported by contract AF-49 (638) 910 of the Air Force Office of Scientific Research as part of the Advanced Research Projects Agency project VELA UNIFORM.

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