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Bulletin of the Seismological Society of America; February 1967; v. 57; no. 1; p. 91-98
© 1967 Seismological Society of America
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A wide range seismogram digitizer

A. J. WICKENS and F. KOLLAR

DOMINION OBSERVATORY, OTTAWA, ONTARIO Canada

Abstract

A visual seismogram drum-digitizer has been developed with precision adequate for the seismograms generated in standard networks. The variable speed, sampling interval and optical magnification permit convenient and efficient digital conversion of a wide range of record traces for different seismological research purposes.

An analysis of the precision has been made: over a dynamic range of 150 mm errors are less than 50 µ, and time intervals accurate to ±.05 sec for short-period seismograms or ±0.2 sec for long-period records.




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