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A thin-sheet model of electromagnetic induction in northern England and southern Scotland

Jozwiak, W.; Beamish, D.. 1986 A thin-sheet model of electromagnetic induction in northern England and southern Scotland. Geophysical Journal International, 85 (3). 629-643. 10.1111/j.1365-246X.1986.tb04537.x

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Abstract/Summary

Electric currents induced in the seas surrounding the British Isles influence the electromagnetic fields observed on land. Observational data suggest that , at certain periods, anomalous currents concentrate in a thin­ sheet comprising the shallow seas and onshore sedimentary sequences. The block and basin structure of northern England and southern Scotland provides a physical basis for the implementation of a thin-sheet approximation in quantitative electromagnetic modelling studies of the region. The model comprises a non-uniform thin-sheet at the surface of a layered half. space. The solution to this problem , as formulated by Vasseur & Weidelt, has been applied to a regional thin-sheet model of northern England and southern Scotland. A regional observational data set, comprising the anomalous vertical field at a period of 750s, is used to constrain possible models. Geological and geophysical observations are used to provide a realistic model for the major sedimentary basin of the region and the results obtained are compared with observations. The results suggest that such a basin is capable of establishing a substantial onshore perturbation in the anomalous vertical field, of similar geometry to that observed. Although the present study is necessarily limited in its depth resolution , it is suggested that other models presented go some way to defining the lateral extent of the conductive configuration for the region.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1365-246X.1986.tb04537.x
Programmes: BGS Programmes > Other
ISSN: 0956-540X
Additional Keywords: electromagnetic induction , models, vertical fields, Britain
NORA Subject Terms: Earth Sciences
Date made live: 12 Apr 2016 13:07 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/513404

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