Abstract
Two 3‐axis SQUID magnetometers were used to perform simultaneous magnetotelluric measurements at two sites separated by 4.8 km near Hollister, California. The data obtained at earch site were analyzed by using a standard least‐squares method, and also using the two magnetic field measurements at the other site as a lock‐in reference. The apparent resistivities obtained from the conventional analysis were nearly always biased downward by noise picked up in the magnetic channels, at some frequencies by as much as two orders of magnitude. By comparison, the same data analyzed with the remote reference technique showed no such bias.
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