Electric and magnetic fields generated by electrokinetic processes in a conductive crust

The results of different models of electrokinetic sources of ULF disturbanc es, mostly based on numerical calculations, can be reproduced with a much s impler analytical model of an elliptic-shaped inhomogeneity. The suggested model can be applied to the estimates of electromagnetic fields from elemen tary sources of different geometries. Moreover, this model enables one to e stimate the screening effect of the back conductivity currents and the infl uence of the ground-atmosphere boundary. The estimates show that the expect ed magnitudes of seismo-electromagnetic signals in ULF band from an element ary electrokinetic source may reach the detection level only for rather fav orable set of crustal parameters. (C) 2001 Elsevier Science Ltd. All rights reserved.