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- W2125100650 abstract "The COPROD2 magnetotelluric (MT) data set obtained over the North American central plains conductivity anomaly in the Canadian shield features a predominantly one-dimensional response at periods shorter than 14 s and a predominantly two-dimensional response at longer periods (to 910 s). A subset of the COPROD2 data consisting of both strike-parallel and strike-perpendicular components of the MT apparent resistivity and phase data at periods between 14-910 s was subjected to the Occam's inversion process, which attempts to find maximally smooth models which fit a data set to a specified misfit. After 9 iterations a model was found fitting these data to 10% in resistivity and 2.9° in phase, and after a few more iterations excess structure was removed to reveal three discrete conductive zones of resistivity less than 1 Ωm at depths of 8-22 km in a relatively resistive background layer of 100-1000 Ωm. The inversion algorithm was modified to take advantage of the 1D structure of the shorter periods, which were inverted to obtain a model representative of surface sediments which extend to a depth of about 2 km. This surface structure was included in the long-period inversion by imposing a second penalty term in the regularized inversion, and the resulting model featured a broader, more complex conductive anomaly and a pronounced, westward-dipping fabric in the mid- to lower-crustal rocks. Graphitic rocks can account for the highly conductive parts of the models." @default.
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- W2125100650 date "1993-01-01" @default.
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- W2125100650 title "Occam's Inversion and the North American Central Plains Electrical Anomaly." @default.
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- W2125100650 doi "https://doi.org/10.5636/jgg.45.985" @default.
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