Geothermal
Figures
Figure 12.1 Main types of geothermal systems. (a) Volcanic systems: heat sources are hot intrusions or magma; (b) Convective systems: heat source is the hot crust at depth in tectonically active areas, with above average heat flow. (c) Sedimentary systems; heat source derives from permeable sedimentary layers at great depths (> 1 km) and above average geothermal gradients (> 30 °C km−1). These systems are conductive in nature rather than convective. Some convective systems (b) may, however, be embedded in sedimentary rocks. Source: Axelsson, G. 2012. The Physics of Geothermal Energy, In: Ali Sayigh, Editor-in-Chief, ...
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