What about the west coast volcanoes in North America?
https://en.wikipedia.org/wiki/List_of_Cascade_volcanoes
...how deep do you have to go to get to the 400C temperature level on some of those volcanoes??
https://en.wikipedia.org/wiki/List_of_Cascade_volcanoes
...how deep do you have to go to get to the 400C temperature level on some of those volcanoes??
Also many hot springs could be potential GeoThermal candidate areas http://www.hotspringsenthusiast.com/USsprings.asp