Abstract

Shock waves in rock at Amchitka were similar to shock waves from shots fired in dense rock at Nevada. Peak vertical accelerations were 3 5 g at surface zero, 8 g at 1300 m (the nearest seawater), and 1 g at 6000 m.

Sea-floor motion and resultant over-pressure in water produced wave forms that show clear effects of multiple reflection in the water. In less than 55 m of water, and at gages shallower than 55 m, pressure decreased proportionately. At the water surface, over-pressure was almost nil.

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