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

Before downloading, please read NORA policies.

Preview

Text
NORA_J&B_GJRAS_1986.pdf - Accepted Version
Download (1MB) | Preview

Official URL: http://gji.oxfordjournals.org/content/85/3/629

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:	https://nora.nerc.ac.uk/id/eprint/513404

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