Rate of Unbiased Geothermal Temperature Profile T_{GN}({\bf r}) change along True Vertical Direction z:
(1) | {\rm Grad} T_{GN}({\bf r}) = \frac{\partial T_{GN}}{\partial z} |
It can be estimated as ratio of true vertical component of regional Earth's Heat Flux j_z({\bf r}) to the subsurface Thermal Conductivity \lambda_e({\bf r}) at a certain subsurface point {\bf r}:
(2) | {\rm Grad} T_{GN}({\bf r}) = \frac{j_z({\bf r})}{\lambda_e({\bf r})} |
The most common value of Unbiased Geothermal Temperature Gradient (GT) away from tectonic plate boundaries is: G_T = 0.025 ÷ 0.035 \, \rm °C/m.
See Also
Geology / Geothermal Temperature Field
[ Geothermal Temperature Gradient (GradTG) ] [ Geothermal Temperature Profile (TG) ]