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U.S. Geological Survey Open-File Report 75-95

Harmonic Magnification of the Complete Telemetered Seismic System, from Seismometer to Film Viewer Screen

By Jerry P. Eaton

Summary

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A collection of notes on the standardization, adjustment, and calibration of the seismic systems employed in the USGS central California microearthquake network (compiled 9/15/70; revised 8/20/73)

Last modified October 20, 2010
First released in paper form 1975

  • This report is available only on the Web.

For additional information:
Contact Information, Earthquake Science Center, Menlo Park Science Center
U.S. Geological Survey
345 Middlefield Road, MS 977
Menlo Park, California 94025
http://earthquake.usgs.gov/

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Suggested citation:

Eaton, J.P., 1975, Harmonic magnification of the complete telemetered seismic system, from seismometer to film viewer screen: U.S. Geological Survey Open-File Report 75-95, 45 p.



Contents

I. Harmonic magnification of the complete telemetered seismic system, from film seismometer to film viewer screen

II. Calculation of response arrays for the NCER telemetered seismic systems

III. Seismograph station calibration procedure

IV. Block diagram and description of the standard system and its components and their nominal operating characteristics

V. Test circuits, definitions, and procedures

Appendix A. L-pad attenuator to damp seismometer and to adjust its output to a desired level

Appendix B. An unbalanced T-pad attenuator for seismic application


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