Accession Number : AD0662635

Title :   THE MECHANICAL ANALYSIS OF QUATERNARY TECTONISM.

Descriptive Note : Final rept. 1 Oct 66-30 Sep 67,

Corporate Author : SHELL DEVELOPMENT CO HOUSTON TEX EXPLORATION AND PRODUCTION RESEARCH DIV

Personal Author(s) : Howard,John H.

Report Date : 31 OCT 1967

Pagination or Media Count : 126

Abstract : The research is concerned principally with the analysis of strains which have developed at the earth's surface during the last 35 years. The report consists of five parts: (1) A summary of objectives and accomplishments and a statement of possible, future, continued research on recent earth-strains; (2) an article explaining the method developed for the analysis of strain when limited data are available on the movements of points within the deformed body; (3) an article devoted to the analysis of strains at Buena Vista Hills, California, during 1932-1959; (4) an article on the analysis of strains during 1932-1966 at two areas which cross the San Andreas Fault in California, the Cholame area and the Taft-Maricopa area; (5) an article demonstrating the applicability of the method to other problems in the analysis of strain, in this case, to the analysis of deformed fossils. Deformation of the earth's surface has occurred within the last 35 years and presumably is continuing today. The deformation is documented by repeated surveys of geodetic movements. Sufficient data exist at a number of areas (for example, Buena Vista Hills, Cholame, and Taft-Maricopa, California) to determine strains. These determinations, however, involve interpolations of data. Estimated principal strains range from +300 x 10 to the -6th power to -5000 x 10 to the -6th power. The estimated rate of change of dilatation for the San Andreas fault zone at Cholame, is as high as 11 x 10 per year (for 1962-1966). Inadequate data prevented a reasonable projection of strains to the moment of the Cholame 1966 earthquake. (Author)

Descriptors :   (*STRUCTURAL GEOLOGY, STRAIN(MECHANICS)), FAULTS(GEOLOGY), DEFORMATION, EARTHQUAKES, MAPS, PHOTOGRAPHS, THRUST, CALIFORNIA

Subject Categories : Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE