Natural subsurface temperature profile along the True Vertical Direction: $\begin{array}{l}T(z)\end{array}$ , where $\begin{array}{l}z\end{array}$ is True Vertical Depth Sub-Sea (TVDss).

It is essentially a true vertical component of local Geothermal Temperature Field $\begin{array}{l}T(x, \, y, \, z)\end{array}$ .

Many subsurface studies are focused on rocks below a specific surface area where lateral ( $\begin{array}{l}\{ x, \, y \}\end{array}$ ) variation of Geothermal Temperature Field maybe insignificant comparing to true vertical ( $\begin{array}{l}\{ z\}\end{array}$ ) variation.

This allows using Geothermal Temperature Profile $\begin{array}{l}T(z)\end{array}$ instead of Geothermal Temperature Field $\begin{array}{l}T(x, \, y, \, z)\end{array}$ .


Fig. 1.1. A sample of Geothermal Temperature Profile.	Fig. 1.2. A sample of Geothermal Temperature Profile with zoom around temperature variations above Neutral Temperature Layer


Fig. 1.3. A sample of Geothermal Temperature Profile at different time moments.	Fig. 1.4. A sample of Geothermal Temperature Profile at different time moments with zoom around temperature variations above Neutral Temperature Layer

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