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Accuracy in LP electromagnetic seismograph calibration by least-squares inversion of the calibration pulse

NATURAL ENVIRONMENT RESEARCH COUNCIL INSTITUTE OF GEOLOGICAL SCIENCES MURCHISON HOUSE, WEST MAINS ROAD, EDINBURGH EH9 3LA SCOTLAND

Abstract

Uncertainties in the instrumental constants for the standard LP instruments of the WWSSN, arising from errors in amplitude measurements of the calibration pulse, are analytically quantified assuming that such measurement errors may be approximated by a perturbing Gaussian noise distribution. More importantly, for the practicing seismologist, uncertainties in magnification and phase delay of the entire instrumental transfer function are deduced from least-squares inversion of the seismogram calibration pulse. It is emphasized that reliable estimates of instrumental transfer functions are obtained by least-squares inversion of the calibration pulse, particularly for underdamped or near critically damped seismographs, where the Gaussian noise distribution is the dominant source of error.

This article has been cited by other articles:

				W.-Y. Kim and G. Ekstrom Instrument responses of digital seismographs at Borovoye, Kazakhstan, by inversion of transient calibration pulses Bulletin of the Seismological Society of America, February 1, 1996; 86(1A): 191 - 203. [Abstract] [PDF]