Abstract
During processing of magnetotelluric (MT) data, acquired in a survey carried out in southern Italy, a problem was encountered, connected with the so‐called ‘dead band’ of the MT signal (around 1 Hz). In the apparent resistivity curves of some MT soundings, a V‐shaped minimum appeared, centred on the dead‐band frequency. This phenomenon turned out to originate from a strong artificial source and was not due to a downward bias of the robust processing techniques adopted. The source distance from the MT sounding locations was such that the V‐shaped minimum fell precisely in the dead‐band frequency range. Theoretical considerations about fields generated by an electric dipole led us to the probable identification of the source as the d.c.‐powered railway between Naples and Bari.
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