Abstract
Electromagnetic induction in the south-west region of Nigeria is studied by comparing laboratory analogue model measurements with observations at eleven field sites. The scaled laboratory model simulates the ocean bathymetry and the coastlines in the region. Model magnetic fields for simulated periods of 20, 30, and 60 min for two mutually perpendicular polarizations of a uniform horizontal source field were used to obtain the in-phase and quadrature induction arrouws. The model results shouw the typical coast effect as expected. The observed arrows show a complex and difficult to interpret behaviour. However, when the model arrows are vectorially subtracted from the observed arrows, the behaviour of the resultant difference arrouws, can be related to induction effects associated with the Benue Trough and several of the north west trending shear zones
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