Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; April 1962; v. 52; no. 2; p. 455-461
© 1962 Seismological Society of America
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The use of a selective amplifier to increase the useful sensitivity of short period electromagnetic seismographs

K. G. BARR

SEISMIC RESEARCH UNIT UNIVERSITY COLLEGE OF THE WEST INDIES, TRINIDAD, WEST INDIES

Abstract

A frequency selective amplifier has been developed to increase the useful sensitivity of short period electromagnetic seismographs to near earthquakes.

The result has been to reduce the magnitude of the smallest earthquake detectable by about two units, and to reduce the magnitude of the smallest earthquake for which an accurate arrival time can be given by 1/2 – 1 units.






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