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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Source biases in midlatitude magnetotelluric transfer functions due to Pc3-4 geomagnetic pulsations

Fig. 1

Map showing distribution of EarthScope MT sites identified as clearly showing source bias (gray filled circles), plotted over vertically integrated Earth conductance (15–150 km) calculated from the inverse solutions of Meqbel et al. (2014) (northwestern USA), Yang et al. (2015) (north-central USA), and Murphy and Egbert (2017) (southeastern USA). For reference, the conductance of constant 100 Ωm Earth between 15 and 150 km would be 1350 S. Markers with purple centers are sites used in the array analysis shown in Fig. 3. Markers with black dots in the center are sites used in the cross-phase analyses shown in Fig. 2. Hollow circles show all available EarthScope MT sites as of this writing. Key geologic features in the northwestern USA that are discussed in the text are shown on the map as well. MHB Medicine Hat Block; Wy Wyoming Craton; SRP Snake River Plain; CP Colorado Plateau

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