Abstract
Instrumentation and analysis of stable test areas are investigated in this paper. Seismometer output via conditioning electronics is monitored by a correlator and a spectrum analyzer. Outputs of these instruments are displayed as probability density functions and spectral densities, which are generated for three parameters; acceleration, velocity, and displacement. A tiltmeter system records signals to indicate small angular motions about the level axes of the test pad. A computer aided x-y plot reducer helps in analysis of these data. Seismic noise data generate integrated spectras for all three functions and tilt data show the peak diurnal angular motion. Final correlations of these results are hand calculated for comparison with accelerometer and gyro error state equations. As a result of the analysis, a grading system has been devised to give stability merit to tested pads.
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