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This applet illustrates the geotherms for two different models of heat production distribution which contribute the same total crustal heat flow. The blue line shows a heat production distribution that decreases exponentially with depth, with a characteristic lengthscale of h_{r }(i.e., at depth h_{r} the heat production is 1/e of the surface value). The red line shows a heat source distribution which is uniform in an upper crustal layer of thickness h_{r}, and zero below this. Note that the exponential model produces rather hotter deep crustal temperatures than the homogeneous model.
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Symbol  Parameter 


q_{c} 
crustal contribution to heat flow 


q_{m}  mantle heat flow 


h_{r}  lengthscale for heat production 


H_{i}  upper crustal heat production_{)} 


k  crustal conductivity 


z_{m}  depth to Moho 

