Accession Number : AD0482820

Title :   TECTONIC FEATURES OF THE EARTH'S CRUST AND UPPER MANTLE.

Descriptive Note : Semiannual technical rept. 22 Feb 65-22 Feb 66,

Corporate Author : PITTSBURGH UNIV PA DEPT OF EARTH AND PLANETARY SCIENCES

Personal Author(s) : Pilant, Walter L.

Report Date : 20 MAY 1966

Pagination or Media Count : 18

Abstract : Preliminary phase delay time residuals have been calculated for Rayleigh surface waves of an earthquake originating on the Mid-Atlantic Ridge at the equator and crossing the U.S. from east to west. Phase velocities over selected regions of the North American continent are compared with previous results. Correlation is good except in the Western U.S. where some disagreemen is present. Transmission coefficients for two-dimensional Rayleigh waves travelling around a corner are obtained. These show a symmetry in transmission ratio and an antisymmetry in phase shift as predicted by first order approximate theory. (Author)

Descriptors :   (*SEISMIC WAVES, NORTH AMERICA), RAYLEIGH SCATTERING, EARTHQUAKES, MAPS, EPICENTERS, VELOCITY, SEISMOLOGICAL STATIONS, CENTRAL AMERICA, HARMONIC ANALYSIS, WAVE PROPAGATION, RECORDING SYSTEMS, ERRORS, DETECTION, TIME STUDIES.

Subject Categories : Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE