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ACOUSTICS AND SEISMICS LABORATORY INSTITUTE OF SCIENCE AND TECHNOLOGY THE UNIVERSITY OF MICHIGAN, ANN ARBOR, MICHIGAN
Abstract
The seismic noise spectrum in the frequency range 0.5 to 31.5 cycles per second is presented graphically for a number of sites over a wide geographical range. Except for a small anomalous effect near 2 or 3 cycles per second, the ground particle motion curves are observed to decrease smoothly with increasing frequency at a rate approximately proportional to the second power of frequency. The curves steepen at frequencies below 1 cycle per second.
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