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Subsurface Geological Environment
Linked via "lithostatic gradient"
Geostatic Pressure and Lithostatic Gradient
Pressure within the SGE increases linearly with depth ($z$), defined by the lithostatic gradient. This gradient is typically calculated using the average density ($\bar{\rho}$) of the overlying material:
$$P(z) = P0 + \int{0}^{z} \rho(z') g \, dz'$$