Earthquake Hazards Program
The spectrum is a curve showing amplitude and phase as a function of frequency or period, or how much of each type of shaking there is from an earthquake.
(Image courtesy Spectra Plus Displays)
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U.S. Department of the Interior | U.S. Geological Survey
Page URL: http://earthquake.usgs.gov/learn/glossary/?termID=184
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Page Last Modified: July 24, 2012 17:12:00 UTC