Accession Number : ADA181495

Title :   Final Technical Report for Contract Number N00014-81-K-0457.

Descriptive Note : Final technical rept.,

Corporate Author : CALIFORNIA UNIV DAVIS DEPT OF GEOLOGY

Personal Author(s) : McClain, James S

PDF Url : ADA181495

Report Date : Jan 1986

Pagination or Media Count : 21

Abstract : The initial work on this contract was to analyze Project ROSE data, and to invert it for the three dimensional structure of the oceanic crust under the East Pacific Rise. We developed a substantial amount of software for the handling of seismic data later work sought to obtain a better understanding of the long-term evolution of the oceanic crust. We proposed to gather data for a seismic transect of the Pacific Ocean spanning ages of 0 to 60 million years. The data we used was from a series of seismic refraction profiles that were conducted in the 1950s. We digitized data from 7 profiles and have analyzed these profiles. Results show that any long-term evolution of the crust in the Pacific is small compared to the normal variability of the structure created when its is formed at the mid-ocean ridges. Of particular importance, we showed that thickening of the oceanic crust was a relatively minor, which contradicts a number of earlier studies that indicated substantial thickening of the crust as it aged.

Descriptors :   *SEISMIC DATA, *OCEANIC CRUST, COMPUTER PROGRAMS, DIGITAL SYSTEMS, EAST PACIFIC RISE, EVOLUTION(GENERAL), HANDLING, LONG RANGE(TIME), OCEAN RIDGES, PACIFIC OCEAN, PROFILES, REFRACTION, SEISMIC WAVES, THREE DIMENSIONAL, VARIATIONS, STRUCTURAL GEOLOGY, THICKNESS

Subject Categories : Geology, Geochemistry and Mineralogy
      Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE