Dictionary:Gassmann equation

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{{#category_index:G|Gassmann equation}} (gasz' man) In 1951, Fritz Gassmann wrote two important papers in rock physics, yielding equations named for him:

Sphere packs[1]

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.

Fluid substitution[2]

See main page Rock physics.


  1. Gassmann, Fritz (1951). "Elastic waves through a packing of spheres". Geophysics 16 (4): 673–685.
  2. Gassmann F. 1951. Über die Elastizität poröser Medien. Vierteljahrsschrift der Naturforschenden Gesellschaft in Zürich, 96, 1-23. Translated as: On elasticity of porous media, in Classics of Elastic Wave Theory, pp. 1-21, M. A. Pelissier, Ed., Soc. Expl. Geoph., Tulsa, 2005.