Accession Number:

AD0631437

Title:

A PRELIMINARY SUMMARY OF A SEISMIC-REFRACTION SURVEY IN THE VICINITY OF THE CUMBERLAND PLATEAU OBSERVATORY, TENNESSEE.

Descriptive Note:

Technical letter,

Corporate Author:

GEOLOGICAL SURVEY DENVER COLO

Personal Author(s):

Report Date:

1966-02-21

Pagination or Media Count:

34.0

Abstract:

A seismic-refraction survey was conducted in the vicinity of the Cumberland Plateau Observatory, Tennessee, C.P.O. in June and July 1965, to determine the velocities of seismic waves in the crust and upper mantle and the crustal structure. A total of 1300 km of reversed seismic -refraction coverage was obtained along two profiles which intersect at the observatory. Each profile is approximately 400 km in length. The velocity of seismic waves is 6.1 kmsec P sub g in the upper crustal layer, 6.7 kmsec P in the intermediate layer, and 8.0 kmsec P sub n or slightly higher in the upper mantle. The depth to the intermediate layer varies from 6.3 km to 14.5 km. The Mohorovicic discontinuity dips toward the south from depths of 35 km in southern Kentucky near Fort Campbell, and Burnside, to depths of 45 km near Gainesville, Georgia, and 51 km near Moulton, Alabama. The preferred crustal model at C.P.O. is H sub 1 12 km, V sub 1 6.1 kmsec H sub 2 28 km V sub 2 6.7 kmsec for a total crustal thickness of 40 km, with an upper-mantle velocity of 8.0 kmsec. Author

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Seismology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE