Accession Number : AD0781271

Title :   Crustal Structure along the Great Basin-Colorado Plateau Transition from Seismic Refraction Profiling.

Descriptive Note : Progress rept. 1 May 72-1 Jun 73,

Corporate Author : UTAH UNIV SALT LAKE CITY DEPT OF GEOLOGICAL AND GEOPHYSICAL SCIENCES

Personal Author(s) : Keller,G. R. ; Smith,R. B. ; Braile,L. R.

Report Date : 01 MAY 1974

Pagination or Media Count : 22

Abstract : A seismic refraction profile was recorded along the southern Wasatch Front, Utah, to investigate crustal structure in the transition zone between the Great Basin and the Colorado Plateau. Interpretation of refracted and reflected phases indicates a thin, 25 km crust, a low Pn velocity of 7.4 km per second and a crustal low-velocity zone. This model along with other geophysical data, is interpreted as evidence for a mantle upwarp that extends at least 50 km east of the physiographic boundary and is coincident with the Intermountain seismic belt. Identification of the crustal low-velocity layer documents this anomalous crustal feature throughout the transition zone between the Great Basin and the Middle Rocky Mountain-Colorado Plateau provinces in Utah. (Author)

Descriptors :   *Earth crust, Earth mantle, Seismic reflection, Utah, Velocity

Subject Categories : Geology, Geochemistry and Mineralogy
      Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE