is force magnitude applied over an area. Overburden pressure
is a geology term that denotes the pressure caused by the weight
of the overlying layers of material at a specific depth under the earth's surface.
is also called lithostatic pressure, or vertical stress.
In a stratigraphic layer
that is in hydrostatic
equilibrium; the overburden pressure at a depth z, assuming the magnitude of the gravity acceleration is approximately constant, is given by:
is the depth in meters
is the overburden pressure at depth
is the pressure at the surface
is the density
of the material above the depth
is the gravity
In deep-earth geophysics/geodynamics, gravitational acceleration varies significantly over depth and
should not be assumed to be constant, and should be inside the integral.
Some sections of stratigraphic layers can be sealed or isolated. These changes create areas where there is not static equilibrium. A location in the layer is said to be in under pressure when the local pressure is less than the hydrostatic pressure, and in overpressure when the local pressure is greater than the hydrostatic pressure.
*Lateral earth pressure
*Pore water pressure