The volcano-magnetic effect |
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| Authors: | Frank D Stacey Kenneth G Barr Geoffrey R Robson |
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| Institution: | (1) Meteorological Office Research Unit, Cambridge, England;(2) Physics Department, University of Queensland, Brisbane, Australia;(3) Seismic Research Unit, University of the West Indies, Kingston, Jamaica;(4) Seismic Research Unit, University of the West Indies, St. Augustine, Trinidad |
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| Abstract: | Summary A geometrically simple volcano is considered, havig a spherical magma chamber of 2.5 km radius centred at 10 km depth. The Curie point isotherm is assumed to be a plane at 20 km depth, except for the spherical volume which is also non-magnetic. The stress pattern in the vicinity of the spherical chamber, due to regional stress of sufficient intensity to cause an eruptions, is used to calculate the change in magnetization which results from the piezomagnetic effect through the volume of solid rock. The consequent magnetic field anomaly at the surface is then obtaied by numerical integration of the dipole law of force over the stressed volume. For rocks of the type found on the volcanic island of St. Vincent (West Indies), this model gives a maximum local volcano-magnet c effect of about 7 gammas. |
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