100 Km sub crustal temperatures - USA.
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The combination of thin crust and high heat flow from the mantle, due to crustal spreading in the basin and range region between the Sierras and the Rockies, explains the many hot springs found in the region.

For a detailed explanation, please see the resource maps for individual states.
Mantle Heat Flow - USA
Regions with temperatures greater than 150oC at 6 km have potential for either conventional geothermal or hot dry rock geothermal power production.