GROUND MOTION STUDIES AT HIGH INCIDENT OVERPRESSURE
SANDIA CORP ALBUQUERQUE NM
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Project 1.5 observed vertical and radial accelerations and vertical displacements produced in the ground by air shock from Shot Priscilla, which had an estimated yield of 37 kt, and a burst height of approximately 700 feet. Instrumentation was included to measure vertical acceleration at two depths in the vicinity of ground zero and both radial and vertical acceleration at the surface and at depths of 10, 30, 60, and 100 feet for pressure ranges of 270, 187, 120, and 59 psi. Vertical acceleration was observed at a depth of 200 feet at the 300-psi station. Relative displacements were measured between the surface and points roughly 10, 30, 60, 100, and 200 feet deep at each pressure range. Motion of three reinforced, cast-in-place, concrete piles extending from the surface to a depth of 100 feet, adjacent to the 187-and 120-psi free-field instrument stations, was studied by accelerometers near the top and bottom of each pile. Permanent ground displacement was observed by preshot and postshot first-order surveys of a series of monuments.