The base map for this figure is the 2008 USGS Geothermal Favorability Map showing relative favorability for the presence of geothermal systems in the western United States. It is an average of 12 models that correlates different geological and geophysical factors of moderate (90-150°C) to high (>150°C) temperature geothermal systems. Exploration regions outlined in red were derived for this study from USGS physiographic regions of the contiguous states. Data source: United States Geological Survey. Map Credit: Billy Roberts
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