Abstract
Heat flow is a fundamental property of the Earth. The Earth is a heat engine that drives plate tectonics and intraplate processes such as hot-spot volcanism unrelated to plate margins. Heat flow, the outward flow of thermal energy from within the Earth through the solid surface of the Earth, is a measure of the thermal energy that drives this heat engine. In addition, temperature in the Earth, which is closely related to heat flow, is a primary parameter controlling physical properties of materials within the Earth. In general, areas of high heat flow are underlain by higher temperatures, at least at shallow depths, than areas of low heat flow. We seek therefore to know the distribution of heat flow from the surface of the Earth and to understand the mechanisms that control its variations.
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