Accession Number : AD0482053

Title :   A GEOMETRICAL METHOD OF STUDYING WAVE PROPAGATION THROUGH REAL GEOLOGIC LAYERED MEDIA.

Descriptive Note : Technical rept. Dec 64-Jan 66,

Corporate Author : AIR FORCE WEAPONS LAB KIRTLAND AFB NM

Personal Author(s) : Cooper, Henry F. ; O'Kobrick, Joseph J.

Report Date : APR 1966

Pagination or Media Count : 50

Abstract : The data from contained nuclear and high-explosive experiments in geologic media are used to obtain the peak particle velocity as a function of the cross-sectional area of an infinitesimal tube of rays originating at the source (this area is proportional to the square of the range). It is then assumed that this function is a general relationship of which the spherical geometry is only a special case. Layered media are then studied by geometrically constructing the relationship for the area of the infinitesimal tube of compressional rays transmitted through the interface. For lack of something better, the transmission coefficients at the interface is taken from the theory of elastic wave propagation. The method currently treats only the transmitted compressional wave, but it may be extended to treat other waves produced by the interface. Two parametric studies involving a tuff-granite interface are made to demonstrate the method. A 1-kiloton source is placed at distances between 20 and 200 feet from the interface in the tuff and the tuff for the source in granite. Thus, the velocities at points off the vertical passing through the source may be higher than the velocity at the same depth directly under the source. The FORTRAN listings for the programs developed are given in the appendixes. (Author)

Descriptors :   *NUCLEAR EXPLOSIONS), (*DETONATION WAVES, (*ROCK, DETONATION WAVES), COMPUTER PROGRAMMING, VELOCITY, ELASTIC PROPERTIES, IGNEOUS ROCK, GRANITE, EXPLOSION EFFECTS, VELOCITY, SOILS, LITHOSPHERE, WAVE PROPAGATION, PROPAGATION, GEOMETRY, PARTICLES, SHEAR STRESSES, HIGH EXPLOSIVE AMMUNITION, SEISMIC WAVES.

Subject Categories : Geology, Geochemistry and Mineralogy
      Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE