The Adams–Williamson equation is a fundamental relation in geophysics and geomechanics that describes the relationship between pore pressure and effective stress in fluid-saturated porous media, particularly in the context of sedimentary rocks. It is used to relate the seismic wave velocities through the saturated rock to the properties of the rock and the fluid it contains.
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In a chemically homogeneous adiabatic spherical region, , coupled to and . Seismic velocities supply ; density normalization and jumps require further data and assumptions.