Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; April 1964; v. 54; no. 2; p. 485-500
© 1964 Seismological Society of America
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Time-varying spectra through optical diffraction scanning

PHILIP L. JACKSON

INSTITUTE OF SCIENCE AND TECHNOLOGY UNIVERSITY OF MICHIGAN, ANN ARBOR, MICHIGAN

Abstract

An optical scanning method has been developed to present frequency content as it occurs and changes throughout a variable-density seismogram. Energy distributions are shown in both frequency and time. A two-dimensional pattern is presented which can be visually evaluated, and is suitable for numerical measurement. Seismic wave dispersions can be revealed and measured through a similar scanning method.




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