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Bulletin of the Seismological Society of America; August 1969; v. 59; no. 4; p. 1713-1717
© 1969 Seismological Society of America
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Benndorf's formula for the dynamic magnification of an electromagnetic seismograph

G. A. BOLLINGER

DEPARTMENT OF GEOLOGICAL SCIENCES VIRGINIA POLYTECHNIC INSTITUTE, BLACKSBURG, VIRGINIA

Abstract

The indicator equation for a seismogram from an electromagnetic seismograph is integrated under the assumption that the trace has the form of a suddenly beginning sinusoid. An expression for the velocity sensitivity is derived from the integrated result and applied to the particular case of a seismometer-galvanometer combination with natural frequencies of 2 Hertz-200 Hertz respectively. For that seismograph the dynamic velocity sensitivity at transducer—earth resonance is one-fifth of the steady-state harmonic sensitivity at resonance.






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