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Ratio of true vertical component of regional Earth's Heat Flux  to the subsurface Thermal Conductivity  at a certain subsurface point :

G_T({\bf r}) = \frac{j_z({\bf r})}{\lambda_e({\bf r})}


Fig. 1. Schematic view of the Earth's Geothermal Temperature Gradient.


The most common value of Unbiased Geothermal Temperature Gradient (GT) away from tectonic plate boundaries is: . 

See Also


Geology / Geothermal Temperature Field

Geothermal Temperature Gradient (GradT) ] [  Geothermal Temperature Profile (TG) ]