Dictionary:Gassmann equation

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{{#category_index:G|Gassmann equation}} (gasz' man) Seismic P-wave velocity through a dense packing of uniform spheres is proportional to

,


where E=Young's modulus, z=pressure (or depth where proportional to pressure), =Poisson's ratio. See Gassmann (1951). Named for Fritz Gassmann, Swiss geophysicist.