Accession Number : AD0818654

Title :   MULTIPLE THREAT CRATERING EXPERIMENT. VOLUME II. GROUND MOTION IN ROCK.

Descriptive Note : Technical rept. Jun-Jul 65,

Corporate Author : AIR FORCE WEAPONS LAB KIRTLAND AFB NM

Personal Author(s) : Gee, John H.

Report Date : JUL 1967

Pagination or Media Count : 166

Abstract : The ground motion portion of this experiment was intended to study the particle velocities, strain, accelerations, displacement, and propagation characteristics of a hard rock medium. Forty-eight gages placed in three bore holes were used to measure the ground motion of eleven shots of the MTCE series. Nine of the shots were 4,000-lb spheres with the remaining two being a 16,000-lb sphere and a 16,000-lb hemisphere. The depth of burial ranged from surface tangent to fully buried. Due to problems involving gage calibrations, gage placement and orientation, and electrical transients, only arrival times and some down-hole magnitude measurements provided enough data for comment. The arrival times indicate that the direct transmitted ground shock outran the air blast. Seismic velocities varied by as much as 3500 fps between the north and south sections of the test area. A further difference in velocity was noted to be connected to a 31-foot difference in elevation between the north and south holes. The up-slope velocity for any given area appears to average approximately 450 fps slower than its down-slope equivalent. (Author)

Descriptors :   (*CRATERING, BASALT), ROCK, MEASURING INSTRUMENTS, TERRAIN, MOTION, SURFACE BURST, TNT, SPHERES, PARTICLES, EJECTION, SHOCK WAVES, STATISTICAL ANALYSIS, FRAGMENTATION, ACCELERATION, VELOCITY, SITE SELECTION, WASHINGTON(STATE), BACKGROUND, NOISE, PROPAGATION, UNDERGROUND EXPLOSIONS, NUCLEAR EXPLOSIONS, SIMULATION, TRANSIENTS.

Subject Categories : Geology, Geochemistry and Mineralogy
      Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE