Rate of Unbiased Geothermal Temperature Profile change along True Vertical Direction
:
{\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 to the subsurface Thermal Conductivity
at a certain subsurface point
:
{\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: .
The difference between Geothermal Temperature Gradient (GradTG) and Unbiased Geothermal Temperature Gradient (GradTGN) is that the former accounts for the effects of the seasonal/daily temperature variations, which are only significant above Neutral Temperature Layer.
Geology / Geothermal Temperature Field
[ Geothermal Temperature Gradient (GradTG) ] [ Geothermal Temperature Profile (TG) ]