SEISMO-MAGNETIC EFFECT AND THE POSSIBILITY OF FORECASTING EARTHQUAKES

SEIZMOMAGNETNI EFERKT IN MOZNOST NAPOVEDOVANJA

About a decade ago Japanese observations of correlated geomagnetic and seismic disturbances led to suggestions that a proper study of geomagnetic observations may provide forewarning of earthquakes. Laboratory experiments on the piezomagnetic properties of basic igneous rocks have confirmed that tectonic stresses are sufficient to produce marked changes in the magnetization of rocks under natural conditions. Such stress-induced magnetic anisotropies must result in readily observable local anomalies in the geomagnetic field. Changes in the field thus reflect changes in the stress patterns producing the anomalies. The stress in the vicinity of an impending earthquake often builds up over a sufficient time (hours at least) for a differential magnetometer system to give a useful indication. Piezomagnetic effect at the time of local earthquakes (Nevada, 1962) and magnetic disturbances preceding the 1964 Alaska Earthquake are reported.

Media Info

  • Features: Figures;
  • Pagination: p. 27-30
  • Serial:
    • Gradbeni Vestnik
    • Volume: 4
    • Issue Number: 2
    • Publisher: Zveza Drustev Gradbenih Inzenirjev In Tehnikov
    • ISSN: 0017-2774

Subject/Index Terms

Filing Info

  • Accession Number: 00264448
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 9 1975 12:00AM