Accession Number : AD0674677

Title :   CHARACTERISTICS OF SEISMIC EFFECT OF UNDERGROUND EXPLOSIONS (OSOBENNOSTI SEISMICHESKOGO EFFEKTA KAMUFLETNYKH VZRYVOV),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Kharin,D. A. ; Kuzmina,N. V. ; Danilova,T. I.

Report Date : 06 DEC 1967

Pagination or Media Count : 20

Abstract : The seismic effect of underground explosions in plastic argillaceous ground was investigated. In the first series of experiments, the dependence of ground motion on the amount of charge (q) and the distance (r) was analyzed; at this depth the strength and stability of the ground at the epicenter is not affected by the explosion. Records of the ground motion as a function of h show the presence of two types of oscillations. The same groups of waves, always observed independently of the amount of charge and h, made it possible to obtain travel-time curves for the first arrivals and characteristic phases. The second series of experiments conducted to obtain more precisely the dependence of ground motion on h. The ratio of amplitudes of surface waves did not remain constant. Formulas were derived for the ground-motion velocity of body and surface waves as a function of h, q, and r for reduced distance. Investigations were also conducted by placing three-component seismic receivers at depths of 5, 10, 15, 20, and 25 m in a shaft 1 m wide and 25 m deep. (Author)

Descriptors :   (*UNDERGROUND EXPLOSIONS, *SEISMIC WAVES), SOILS, PLASTIC PROPERTIES, SEISMOGRAPHS, FREQUENCY, WAVE PROPAGATION, TEST METHODS, TEST EQUIPMENT, SCALE, OSCILLATION, USSR

Subject Categories : Seismology
      Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE