Postshot Disturbances and Surface Motions: Operation Hardtack-II

L. M. Swift

Jan 1960 · Office of Technical Services, Department of Commerce

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Postshot earth disturbances and surface displacements were measured as functions of time after two deep underground nuclear detonations using the magnetically recorded output of geophones and the sight readings of simple liquid-level gages as evaluation of the applicability of these measurement methods in detailed location of deep underground bursts subsequent to their general location by other means. The low yield of one shot and the unexpectedly high noise interference precluded establishing the limits of the geophone listening technique. However, the records obtained from the geophones and the liquid-level gages indicate that these techniques are feasible for second stage detection of underground bursts. Further tests of the techniques are recommended after modifications are made to instrumentation to reduce the noise interference in the geophones and to reduce the error in the liquid-level gages.