Noise Reduction Techniques for Use in Determining Local Geomagnetic Field Changes

  • R. H. Ware
  • P. L. Bender
Conference paper
Part of the Advances in Earth and Planetary Sciences book series (AEPS, volume 5)


Measurements of the difference in total field ΔF(t) have been made over a 16 km N-S path near Boulder. The behavior observed is quite different from that for an E-W path. The present accuracy of the narrow line rubidium magnetometers used is about 0.01 γ. The N-S variations appear to correlate mainly with variations in H rather than D, and may be associated with either gradients of external fields or currents in shallow conductivity anomalies. More recently three magnetometers have been set up on a straight E-W line so that the ‘second difference’ can be measured, and a transfer function from field component variation to the second difference can be determined. A generalization of this approach will be used for analyzing USGS tectonomagnetic data from California.


Total Field Crustal Stress Noise Reduction Technique Poor Coherence Denver Basin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Allen, J.H. and P.L. Bender, Narrow line rubidium magnetometer for high accuracy field measurements, J. Geomag. Geoelectr., 24, 105–125, 1972.CrossRefGoogle Scholar
  2. Beahn, T.J., Geomagnetic field gradient measurements and noise reduction techniques in Colorado, J. Geophys. Res., 81, 6276–6280, 1976.CrossRefGoogle Scholar
  3. Brill, R., Differential geomagnetic field measurements at the edge of the Denver Basin, J. Geophys. Res., 80, 1593–1599, 1975.CrossRefGoogle Scholar
  4. Gough, D.I., Effects of induction in the earth upon measurements of external time-varying magnetic fields, EOS, Trans. Am. Geophys. Union, 55, 595–599, 1974.Google Scholar
  5. Johnson, M.J.S., B.E. Smith, and R. Mueller, Tectonomagnetic experiments and observations in Western U.S.A., J. Geomag. Geoelectr., 28, 85–97, 1976.CrossRefGoogle Scholar
  6. Smith, B.E. and M.J.S. Johnston, A tectonomagnetic effect observed before a magnitude 5.2 earthquake near Hollister, California, J. Geophys. Res., 81, 3556–356, 1976.CrossRefGoogle Scholar

Copyright information

© Center for Academic Publications Japan 1979

Authors and Affiliations

  • R. H. Ware
    • 1
  • P. L. Bender
    • 1
    • 2
  1. 1.Joint Institute for Laboratory AstrophysicsUniversity of Colorado and National Bureau of StandardsBoulderUSA
  2. 2.Quantum Physics DivisionNational Bureau of StandardsUSA

Personalised recommendations