Natural magnetic disturbance fields, not precursors, preceding the Loma Prieta earthquake

@article{Campbell2009NaturalMD,
  title={Natural magnetic disturbance fields, not precursors, preceding the Loma Prieta earthquake},
  author={W. Campbell},
  journal={Journal of Geophysical Research},
  year={2009},
  volume={114}
}
  • W. Campbell
  • Published 2009
  • Geology
  • Journal of Geophysical Research
[1] Available records of the magnetic indices Dst and ap together with standard observatory recordings of 1-min field levels were examined for the period preceding the earthquake of October 1989, centered near Loma Prieta, California. The magnetic records showed that the Fraser-Smith et al. (1990) report claiming the existence of a 100-s (ultralow frequency) geomagnetic field precursor signal at Corralitos, California, foretelling a nearby earthquake is not valid. My study shows that the… Expand

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