Rate of Geothermal Temperature T_G({\bf r}) change along True Vertical Direction:
| (1) | {\rm Grad} \, T_G({\bf r}) = \frac{\partial T_G}{\partial z} |
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| Fig. 1. Schematic view of the Earth's Geothermal Temperature Gradient. |
The common agreement is that
(1) 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 : GT = 0.025 ÷ 0.030 °C/m.
See Also
Geology / Geothermal Temperature Field
[ Unbiased Geothermal Temperature Gradient (GT) ]