Pm. Adler et al., Electrokinetic and magnetic fields generated by flow through a fractured zone: A sensitivity study for La Fournaise volcano, GEOPHYS R L, 26(6), 1999, pp. 795-798
A number of electric and magnetic signals have been observed on La Fournais
e volcano, attributed to electrokinetic effects. A simple model is proposed
here to check this hypothesis. The volcano is idealized as a 2d heterogene
ous structure composed of a fractured zone located between two porous zones
through which meteoritic waters flow downwards; flow occurs predominantly
in the fractured zone and induces electromagnetic fields. Correct orders of
magnitude are obtained for the measured surface fields. The importance of
the heterogeneous character of the underground medium is demonstrated; loca
l measurements of various quantities are recommended.