Accession Number : AD0865673

Title :   A Study of Seismic-Wave Propagation and Detection,

Corporate Author : MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY

Personal Author(s) : Willis, D. E.

Report Date : OCT 1960

Pagination or Media Count : 13

Abstract : An investigation of the seismic waves generated by high-explosive detonations disclosed that the ratios of the maximum vertical ground displacement were equal to the approximate first-power ratios of the respective charge sizes. With use of this relationship, a number of high-explosive and nuclear shots were normalized to a 1.7-kiloton nuclear shot. Empirical equations were found which describe the decrease in the maximum vertical component of ground motion between 1 and 1000 km. Empirical equations were also determined for compressional waves which allow the decrease in vertical ground-particle velocity to be computed as a function of distance and frequency. Such factors as method of firing depth of charge, and rock type were shown to have an effect on the spectra of seismic waves generated by explosive blasts. (Author)

Descriptors :   (*UNDERGROUND EXPLOSIONS, SEISMIC WAVES), (*SEISMIC WAVES, PROPAGATION), EARTHQUAKES, NUCLEAR EXPLOSIONS, SEISMOMETERS, POWER SPECTRA, ATTENUATION, ROCK, TERRAIN, MOTION, PHASED ARRAYS, BLAST.

Subject Categories : Seismology
      Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE