An analogue model study of electromagnetic induction in the Vancouver Island region.

Abstract

The behaviour of the time-varying electromagnetic fields over the Vancouver Island region is investigated using a scaled analogue model. The results show that conductive channelling in the shallow seawater channel around the island is important for both E and H polarization of the inducing field and for all frequencies studied. It appears that channelled telluric currents flow along either side of Vancouver Island with some diffusion of current into the continent to the southeast of the island. For the H polarization case there is some evidence of current flow around the SE tip of Vancouver Island as well. The results also show the effects of local confinement of current whereby the direction of telluric flow is modified by the geometry of the seawater channel.