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Bulletin of the Seismological Society of America; December 1966; v. 56; no. 6; p. 1193-1205
© 1966 Seismological Society of America
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Seismometer analysis using an electric current analog

F. KOLLAR and R. D. RUSSELL

SEISMOLOGY DIVISION OBSERVATORIES BRANCH DEPARTMENT OF MINES AND TECHNICAL SURVEYS, OTTAWA, Canada
DEPARTMENT OF GEOPHYSICS UNIVERSITY OF BRITISH COLUMBIA, VANCOUVER, Canada

Abstract

It is well known that purely electrical circuit equivalents exist for electromechanical seismometers, and that they are useful for the analysis of the performance of such instruments. This paper calls attention to the advantages obtained by representing ground-motion and related quantities as current sources rather than voltage sources which have been usually used. The use of current sources in many instances preserves the symmetry inherent in the mechanical resonant system and results in substantial simplifications in some analysis procedures.

Two particular studies are described, a quantitative investigation of the effect of the approximations in the application of the Maxwell impedance bridge to seismometer calibration, and the evaluation of the fundamental instrument noise of a seismometer.




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