CAGN:A COMPUTER PROGRAM FOR POINT SOURCE, TRANSIENT, ELASTIC, ULTRASONIC LONGITUDINAL AND SHEAR WAVES

摘要

A computer program, CAGN, has been developed that computes displacements of solids and displacements or pressures of liquids. The mathematical model is for a point source of elastic waves a height, h, above the plane boundary of two semi-infinite elastic media. The media may be solids or liquids or vacuum (for free surfaces);the sources may be longitudinal (seismic P waves) or either of two shear polarizations (seismic SV or SH waves). Analysis of equations developed in the solution of the wave propagation clarifies the mechanisms of critical refraction and surface wave formation. The code provides more exact solutions of the response waveform from a given input waveform which should illuminate present frequency analysis problems.