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The GRMPY surface ground motion data collection system was fielded on two shallowly buried high explosive tests in Area 16 at the Nevada Tests Site. Excellent data were collected on both tests and on two very small high explosive calibration tests conducted prior to the main tests. The data superficially resemble surface ground motion data for nuclear weapons tests, but there are differences. The most obvious is the rate of decline in peak vertical velocity with horizontal distance. Less obvious is the ratio of the surface ground zero peak vertical acceleration to the surface ground zero peak vertical velocity. The ramifications of these features as tools for on-site verification are explored

GRMPY surface ground motion measurements in Area 16