Conus Electrical Resistivity at 35km(usgs.gov)

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https://www.usgs.gov/media/images/conus-electrical-resistivity-35km

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Electrical resistivity at lower-crustal depths (35 km) beneath the contiguous U.S. The architecture of the nation is revealed at this depth with warm colors marking active extension beneath the western U.S. The cratonic building blocks are resistive (cool colors) and were joined throughout geologic time along linear conductive sutures beneath the central and eastern U.S.