Abstract
Present status of heat flow data is reviewed briefly. Topics such as the chondritecoincidence, upward concentration of heat source in the earth’s interior, possible differences between continental mantle and oceanic mantle, mechanism of heat transfer in the mantle, correlation between heat flow and geologic features, and heat flow in the volcanic areas are discussed. Finally, energetics of volcanic activity is treated with special reference to the Rikitake-Yokoyama’s energy.
