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Bulletin of the Seismological Society of America; February 1980; v. 70; no. 1; p. 293-303
© 1980 Seismological Society of America
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A new assessment of errors from digitization and base line corrections of strong-motion accelerograms

JAFAR SHOJA-TAHERI*

SEISMOGRAPHIC STATION DEPARTMENT OF GEOLOGY & GEOPHYSICS UNIVERSITY OF CALIFORNIA, BERKELEY, CALIFORNIA 94720

Abstract

Statistical analysis of strong-motion records of the 1966 Parkfield earthquake and the 1952 Taft earthquake indicates that the usable limit of long period of velocity and displacement, calculated by integration of the accelerogram records, is restricted mainly by human reading and base line correction errors. Base line correction errors arise from uncertainties in the coefficients of the fitted straight base line. Calculation by the jackknife method of the variances of the errors in displacement records from linear base line corrections indicates that these errors are more pronounced in the long-period (above 7 sec) range than errors from digitization. The records analyzed in this paper indicate that long-period limits due to the combined errors vary between 7 and 14 sec. Beyond these limits components of displacement spectra from the present analog accelerograms are not reliable measures of ground motion.

Footnotes

* Present address: Geophysics Department, School of Sciences, Ferdowsi University, Mashad, Iran.




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C. B. CROUSE and T. MATUSCHKA
Digitization noise and accelerograph pen offset associated with Japanese accelerograms
Bulletin of the Seismological Society of America, August 1, 1983; 73(4): 1187 - 1196.
[Abstract] [PDF]


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