Earth, Planets and Space

, Volume 51, Issue 10, pp 1099–1117 | Cite as

The use of electromagnetic data for short-term prediction of Vrancea (Romania) earthquakes: Preliminary data

  • B. D. Enescu
  • D. Enescu
  • A. P. Constantin
Open Access


Diagrams from electromagnetic data that were recorded at Muntele Roşu Observatory during the periods from December 1996 to January 1997, and December 1997 to September 1998 were plotted. The times when Vrancea earthquakes of magnitudes M ≥ 3.9 occurred within these periods are marked on the diagrams.

The magnetic data prove that Vrancea earthquakes are preceded by magnetic perturbations that may be regarded as their short-term precursors. Some of these perturbations may also be regarded either as geomagnetic storms or as instrument effects.

Perturbations, which could likewise be seen as short-term precursors of Vrancea earthquakes, are also noticed in the electric records. Still, a number of electric data do cast a doubt on their forerunning nature.

Some suggestions are made in the end of the paper on how electromagnetic research should go ahead to be of use for Vrancea earthquake prediction.


Magnetic Anomaly Geomagnetic Storm Earthquake Prediction Magnetic Perturbation Anomalous Change 
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.


  1. Enescu, B. D., C. Ionescu, and D. Enescu, Establishment of two electro-magnetic observatories in Vrancea (Romania) seismic area, Romanian Journal of Physics, 1999 (in press).Google Scholar
  2. Ernst, T., J. Jankowski, C. Rozluski, and R. Teisseyre, Analysis of the electromagnetic field recorded in the Friuli seismic zone, northeast Italy, Tectonophysics, 224, 141–148, 1993.CrossRefGoogle Scholar
  3. Fraser-Smith, A. C., A. Bernardi, P. R. McGill, M. E. Ladd, R. A. Helliwell, and O. G. Villard, Jr., Low frequency magnetic field measurements near the epicenter of the MS 7.1 Loma Prieta earthquake, Geophys. Res. Lett., 17, 1465–1468, 1990.CrossRefGoogle Scholar
  4. Gokhberg, M. B., V. A. Morgunov, T. Yoshino, and I. Tomizawa, Experimental measurement of electromagnetic emissions possibly related to earthquakes in Japan, J. Geophys. Res., 87, 7824–7828, 1982.CrossRefGoogle Scholar
  5. Honkura, Y., E. R. Niblett, and R. D. Kurtz, Changes in magnetic and telluric field in a seismically active region of Eastern Canada: preliminary results of earthquake prediction studies, Tectonophysics, 34, 219–230, 1976.CrossRefGoogle Scholar
  6. Johnston, M. J. S., Review of electric and magnetic fields accompanying seismic and volcanic activity, Surv. Geophys., 18, 441–475, 1997.CrossRefGoogle Scholar
  7. Oncescu, M. C., V. I. Marza, M. Rizescu, and M. Popa, The Romanian Earthquake Catalogue, 984–1996, Natural Hazards, 1998 (in press).Google Scholar
  8. Park, S. K., M. J. S. Johnston, T. R. Madden, F. D. Morgan, and H. F. Morrison, Electromagnetic precursors to earthquakes in the ULF band: a review of observations and mechanisms, Rev. Geophys., 31, 117–132, 1993.CrossRefGoogle Scholar
  9. Varotsos, P., K. Alexopoulos, and M. Lazaridou, Latest aspects of earthquake prediction in Greece based on seismic electric signals, II, Tectonophysics, 224, 1–38, 1993.CrossRefGoogle Scholar
  10. Yoshino, T., Low-frequency seismogenic electromagnetic emissions as precursors to earthquakes and volcanic eruptions in Japan, J. Sci. Explor., 5, 121–144, 1991.Google Scholar

Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 1999

Authors and Affiliations

  1. 1.National Institute for Earth PhysicsBucharest-MagureleRomania

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