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Fig. 1


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Locations (red stars) and names of 23 MT sites installed in Scotland and northern England during 2017 and 2018. Pink triangle marks the position of ESK geomagnetic observatory. Purple and white lines are the longest (>50 km) 12 high-voltage – 275 kV and 400 kV, respectively – transmission lines in the region (Viljanen et al., 2013; Kelly et al., 2017). Dashed lines delineate the Great Glen Fault (Kennedy, 1946), Highland Boundary Fault (Tanner, 2008) and Southern Uplands Fault (Oliver et al., 2002). The highest topography is located between sites CAI and MAR. This region is referred to as the Cairngorms.

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