TECTONIC FEATURES OF THE EARTH'S CRUST AND UPPER MANTLE

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 resu...

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Bibliographic Details
Main Author: Pilant, Walter L
Format: Report
Language:English
Subjects:
CENTRAL AMERICA
DETECTION
EARTH CRUST
EARTHQUAKES
EPICENTERS
ERRORS
HARMONIC ANALYSIS
MANTLE(EARTH)
NORTH AMERICA
RAYLEIGH SCATTERING
RECORDING SYSTEMS
SEISMIC WAVES
SEISMOLOGICAL STATIONS
Seismology
TIME STUDIES
VELOCITY
WAVE PROPAGATION
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Summary: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)