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Bulletin of the Seismological Society of America; April 2005; v. 95; no. 2; p. 745-750; DOI: 10.1785/0120040160
© 2005 Seismological Society of America
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Short Note

On Pads and Filters: Processing Strong-Motion Data

David M. Boore1

1 U.S. Geological Survey, MS 977
345 Middlefield Road
Menlo Park, California 94025
boore{at}usgs.gov

Processing of strong-motion data in many cases can be as straightforward as filtering the acceleration time series and integrating to obtain velocity and displacement. To avoid the introduction of spurious low-frequency noise in quantities derived from the filtered accelerations, however, care must be taken to append zero pads of adequate length to the beginning and end of the segment of recorded data. These padded sections of the filtered acceleration need to be retained when deriving velocities, displacements, Fourier spectra, and response spectra. In addition, these padded and filtered sections should also be included in the time series used in the dynamic analysis of structures and soils to ensure compatibility with the filtered accelerations.




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