Encyclopedia of Geomagnetism and Paleomagnetism

2007 Edition
| Editors: David Gubbins, Emilio Herrero-Bervera

Volcano‐Electromagnetic Effects

  • Malcolm J.S. Johnston
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-4423-6_315

Volcano‐electromagnetic effects—electromagnetic (EM) signals generated by volcanic activity—derive from a variety of physical processes. These include piezomagnetic effects, electrokinetic effects, fluid vaporization, thermal demagnetization/remagnetization, resistivity changes, thermochemical effects, magnetohydrodynamic effects, and blast‐excited traveling ionospheric disturbances (TIDs). Identification of different physical processes and their interdependence is often possible with multiparameter monitoring, now common on volcanoes, since many of these processes occur with different timescales and some are simultaneously identified in other geophysical data (deformation, seismic, gas, ionospheric disturbances, etc.). EM monitoring plays an important part in understanding these processes.

Brief history

The identification of electromagnetic field disturbances associated with volcanic activity has a relatively young history. Initial measurements in the 1950s on Mihara volcano in Japan...

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© Springer-Verlag 2007

Authors and Affiliations

  • Malcolm J.S. Johnston

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