Forty-three masonry structures in Mercury, Nevada were inspected for cracking before and after nuclear detonations at the Nevada Test Site, at distances of from 33 to 78 km from Mercury. The same buildings were inspected during periods of no significant nuclear activity. Findings include evidence that peak-particle velocities of 0.1 to 0.3 cm/sec caused, on the average, 24 cracks in the 43 buildings, as compared to about 2.5 cracks during a similar time span of no nuclear activity. Cracks at these low levels of motion are not more severe than those occurring naturally.

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