Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; July 1950; v. 40; no. 3; p. 233-242
© 1950 Seismological Society of America
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Seismic refraction measurements in the Atlantic Ocean Basin*

(Part one)

MAURICE EWING, J. L. WORZEL, J. B. HERSEY, FRANK PRESS and G. R. HAMILTON

LAMONT GEOLOGICAL OBSERVATORY (COLUMBIA UNIVERSITY)

Abstract

A REVERSED seismic refraction measurement was made 120 miles northwest of Bermuda (400 miles east of Cape Hatteras) in 2,800 fathoms of water. A velocity of 24,800 feet per second (7.58 km/sec.) for the second layer was identified with the ultrabasic layer of earthquake seismology. Assuming a velocity of 5,600 feet per second (1.70 km/sec.), clearly indicated by earlier measurements, a thickness of 4,500 feet was obtained for the sedimentary layer. The granitic and intermediate layers were absent.

Footnotes

* Manuscript received for publication July 22, 1949.




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