Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; October 1960; v. 50; no. 4; p. 561-562
© 1960 Seismological Society of America
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Checking the performance of electrodynamic seismometers

P. PETERSON

ROYAL OBSERVATORY,, HONG KONG

Abstract

The performance of electrodynamic seismometers slowly deteriorates as the magnets age and the hinges become strained. This deterioration can be determined by the extremely simple measurement of the d.c. sensitivities of the seismometer and galvanometer and the change in the theoretical synchronous magnification can be calculated.






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