Birch's law

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Birch's law establishes a linear relation of the compressional wave velocity vp of rocks and minerals of a constant average atomic weight Mavg with density \rho as:

 v_p = a(M_\mathrm{avg}) + b \rho,

for some function a(x).[1]

Francis Birch published two papers[2][3] in 1961, which later became known as Birch's Law.

See also[edit]


  1. ^ Poirier, Jean-Paul (2000). Introduction to the physics of the earth's interior (2nd ed.). Cambridge [u.a.]: Cambridge Univ. Press. p. 80. ISBN 9780521663922. 
  2. ^ Birch, F. (1961). "The velocity of compressional waves in rocks to 10 kilobars. Part 2". Journal of Geophysical Research 66 (7): 2199–2224. Bibcode:1961JGR....66.2199B. doi:10.1029/JZ066i007p02199. 
  3. ^ Birch, F. (1961). "Composition of the Earth's mantle". Geophysical Journal of the Royal Astronomical Society 4: 295–311. Bibcode:1961GeoJI...4..295B. doi:10.1111/j.1365-246X.1961.tb06821.x.