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Rate of Geothermal Temperature 

LaTeX Math Inline
body--uriencoded--T_G(%7B\bf r%7D)
change along True Vertical Direction 
LaTeX Math Inline
bodyz
:

LaTeX Math Block
anchorGT
alignmentleft
{\rm Grad_T} \, T_G({\bf r}) = \frac{\partial T_G}{\partial z}

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The common agreement is that 

LaTeX Math Block Reference
anchorGT
 does not account effects of the seasonal/daily temperature variations ( which are only noticeable above Neutral Temperature Layer ). The most common value of Geothermal Temperature Gradient away from tectonic plate boundaries  boundaries is: GT = 0.025 ÷ 0.030 °C/m035 °C/m. 


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. 

See Also

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Geology / Geothermal Temperature Field

Unbiased Geothermal Temperature Gradient (GTGradTGN) ] [  Unbiased Geothermal Temperature Profile (TGN) ]