Fig. 1


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(a) Location of the three UK geoelectric measurement systems. (b) LEMI 701 electrodes on test. (c) Map of geoelectric probe locations at Hartland observatory. (d) Stackplot of North–South (NS) component of the geoelectric field at Hartland for June 2013 showing a clear M2 (lunar) tidal periodic signal with peak to peak variation of around 20 mV/km.

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