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Bulletin of the Seismological Society of America; October 1963; v. 53; no. 5; p. 989-996
© 1963 Seismological Society of America
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Spectral energy density for quarry explosions

G. E. FRANTTI

ACOUSTICS AND SEISMICS LABORATORY UNIVERSITY OF MICHIGAN, ANN ARBOR, MICHIGAN

Abstract

Several explosions of varying time duration have been recorded at 156 km along a constant propagation path from a central Michigan limestone quarry. Energy density for body waves and surface waves is examined as a function of frequency and observed to peak between 1 and 10 cps. A correlation between spectral amplitudes and source duration time is revealed and is emphasized at shot durations which approximate the dominant period of seismic waves. A study of the data suggests that seismic energy levels may be controlled, in part, by regulating the time duration of delayed quarry blasts. This parameter (total duration time) has been generally neglected in published studies involving commercial blasts.




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