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3,000,000 2,500,000 Chapter 2 Geothermal ResourceBase Assessment Depths of US Maps 2,000,000 1,500,000 1,000,000 3.5 km 4.5 km 5.5 km 6.5 km 7.5 km 8.5 km 9.5 km 219 500,000 Temperature at depth, oC Temperature label centered under 6.5 km bar 100 150 200 250 300 350 400 (excluding AK & HI) Figure 2.8b Histograms of United States area at a given temperature, as a function of depth for 1 km slices. Although the EGS resource base is huge, it is not evenly distributed. Temperatures of more than 150°C at depths of less than 6 km are more common in the active tectonic regions of the western conterminous United States, but by no means are confined to those areas. The highest temperature regions represent areas of favorable configurations of high heat flow, low thermal conductivity, plus favorable local situations. For example, there are high heatflow areas in the eastern United States where the crustal radioactivity is high, such as the White Mountains in New Hampshire (Birch et al., 1968) and northern Illinois (Roy et al., 1989). However, the thermal conductivity in these areas is also high, so the crustal temperatures are not as high as areas with the same heat flow and low thermal conductivity, such as coastal plain areas or a Cenozoic basin in Nevada. The most favorable resource areas (e.g., the Southern Rocky Mountains) have a high tectonic component of heat flow, high crustal radioactivity (Decker et al., 1988), areas of low thermal conductivity (as in young sedimentary basins), and other favorable circumstances such as young volcanic activity. There are also areas of low average gradient in both the eastern and western United States. In the tectonically active western United States, the areas of active or young subduction have generally low heat flow and low gradients. For example, areas in the western Sierra Nevada foothills and in the eastern part of the Great Valley of California are as cold as any area on the continent (Blackwell et al., 1991). Area for each depth slice, km2PDF Image | Geothermal Resource Base Assessment
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