Accession Number : AD0628490

Title :   SEISMIC STUDIES ON THE ALASKAN COASTAL PLAIN.

Descriptive Note : Final rept.,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS DEPT OF GEOLOGY AND GEOPHYSICS

Personal Author(s) : Mooney,Harold M.

Report Date : JAN 1966

Pagination or Media Count : 103

Abstract : Results are presented (or referenced from earlier reports) for three seasons, 1961-1963, of seismic field work in the vicinity of Point Barrow, Alaska. Seismic refraction data are interpreted in terms of a shallow geologic section near Point Barrow and a crustal section based upon a 280 kilometer profile northwestward from Point Barrow. The former yields velocities of 2.5, 3.1 and 4.8 km/sec with depths to top of 0, 0.4, and 1.0 kilometers. The latter has been interpreted on the basis of three geological models; all include a shallow section with thickness 10-12 kilometers and velocity 4.96 km/sec, an intermediate section with velocity 6. 1-6.6 km/sec, and a high-velocity refractor with velocity 7.56 km/sec at a depth of 28-32 kilometers. Evidence is cited to support the interpretation of the high-velocity refractor as the top of the earth's mantle. Seismic noise analyses were carried out on 14 of 90 available records taken at a location 50 kilometers southwest of Point Barrow. Displacement spectra in the 2-32 cps range were computed for each of the 6 vertical geophones on a 4-km spread. Phase spectra and coherence were determined for a three-component station. Six second noise samples were used, digitized at 0.01 second intervals. (Author)

Descriptors :   (*ALASKA, SEISMOLOGY), (*SEISMOLOGY, ALASKA), GEOLOGY, LITHOSPHERE, SEISMIC WAVES, PROPAGATION, GEOPHYSICAL PROSPECTING, UNDERGROUND EXPLOSIONS

Subject Categories : Geology, Geochemistry and Mineralogy
      Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE