McMillan and Oldenburg (2014) develop a method for cooperatively inverting multiple electromagnetic data sets to produce a “consistent” 3D resistivity/conductivity model with improved resolution. Their data set includes airborne-time-domain electromagnetic data, controlled-source audio-frequency magnetotellurics (with inline electric-field and orthogonal magnetic-field measurements for frequencies ranging between 2 and 2048 Hz), and DC resistivity data. Because (1) conductivity/resistivity is known to be frequency-dependent especially in the presence of disseminated metallic particles (Wong, 1979; Marchant et al., 2013), (2) the range of frequencies investigated by McMillan and Oldenburg (2014) is rather substantial (four orders of magnitudes), and...

You do not currently have access to this article.