Surface and Subsurface Strong Motion Measurements

William R. Perret

thg 1 1959 · United States Atomic Energy Commission, Technical Information Service Extension

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Acceleration data from the vertical array follow the trends of variation with radial range similar to those indicated by Rainier data: peak accelerations vary inversely with fourth power of range up to the base of the caprock, where the trend inverts and peaks increase toward the surface. Stress, strain, and temperature gages yielded no relevant information. Surface accelerations include a few data which represent signals of only a few percent of gage range and are consequently of low precision. Peak accelerations decrease with increased range, but scatter does not permit a clear distinction between suggested R-2 and R-3 variation. Photography from Project 26.10 showed that the ground surface above Evans did not move more than 2 inches, the limit of resolution of the camera system. Movement of targets near Blanca surface zero was defined for a period of greater than 8 seconds after detonation.