Operation Prairie Flat, Project LN 302: Earth Motion and Stress Measurements.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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The objectives of this study were to measure and interpret the earth motions and stresses produced by the Prairie Flat 500-ton TNT detonation. Acceleration, particle velocity, and soil stress gages were installed to measure the ground motions and stresses encompassed by the 2,000- to 10-psi predicted airblast overpressure region 84 to 1,150 feet from ground zero and depths below the ground surface of 1,5 to 30 feet. Time histories of all successful measurements are included in Appendixes A and B. Ground shock arrival times indicated the occurrence of outrunning ground motion at a distance of about 560 feet, or the 35-psi pressure level. Author