Deep crustal geoelectric structure beneath the Northumberland Basin

Beamish, David. 1986 Deep crustal geoelectric structure beneath the Northumberland Basin. Geophysical Journal of the Royal Astronomical Society, 84 (3). 619-640.

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In terms of lateral variations in conductivity structure, the southern Southern Uplands and Northumberland Basin are characterized by a region of attenuated vertical magnetic fields with small spatial gradients reflecting the presence of a substantial conducting zone. Five magnetotelluric data sets from the region have been analysed to provide accurate and unbiased estimates of the impedance tensor. The response data are used to investigate the deep geoelectric crustal structure of the region. Three appropriate sets of response data have been subjected to two construction algorithms for 1-D inversion. The geoelectric profiles recovered identify a deep crustal conducting zone underlying the Northumberland Basin. The zone, modelled as a layered structure, dips steeply from mid-crustal depths underneath the Northumberland Basin to lower crustal depths to the NW. The structure thus correlates, in location and geometry, with a deep crustal reflecting wedge detected offshore by a deep seismic reflection profile.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BGS Programmes > National Geoscience Framework
NORA Subject Terms: Earth Sciences
Date made live: 10 Aug 2015 14:13 +0 (UTC)

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