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1) What do you mean by Lithospheric pressure ?
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Answer:
Pressure 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. Overburden pressure is also called lithostatic pressure, or vertical stress.
Answer:
Lithostatic Pressure Gradient
The lithostatic pressure gradient is caused by the density of the rocks and is transmitted through the grain-to-grain contacts of successive layers of rocks. The lithostatic weight is, however, supported by the pressure of the subsurface fluids in the pore spaces. Thus, the overburden pressure is equal to the grain-to-grain lithostatic pressure plus the fluid pressure of the porous formation, yielding an average overburden pressure gradient of 22.7 kPa per meter of depth (1.0 psi/ft), which corresponds to an overall bulk specific gravity of the rocks plus the interstitial fluids equal to 2.31
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