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 h English (en)where <math>\rho </math> is bulk density given in g/cm<sup>3</sup>, <math>V_p</math> is P-wave velocity given in ft/s, and <math>\alpha</math> and <math>\beta</math> are empirically derived constants that depend on the [[Special:MyLanguage/geology|geology]]. Gardner et al. proposed that one can obtain a good fit by taking <math>\alpha = 0.23</math> and <math>\beta = 0.25</math>.<ref name="Gardner">{{cite journal|last=Gardner|first=G.H.F.|coauthors=Gardner L.W. & Gregory A.R.|year=1974|title=Formation velocity and density -- the diagnostic basics for stratigraphic traps|journal=Geophysics|volume=39|pages=770–780|doi = 10.1190/1.1440465 }}</ref> Assuming this, the equation is reduced to:
 h Spanish (es)donde <math>\rho </math> es la densidad aparente en  g/cm<sup>3</sup>, <math>V_p</math> es la velocidad de la onda P en ft/s, y <math>\alpha</math> y <math>\beta</math> son constanres empíricamente derivadas que dependen de la [[Special:MyLanguage/geology|geología]]. Gardner et al. propusieron que se puede optener un buen ajuste suponiendo que <math>\alpha = 0.23</math> y <math>\beta = 0.25</math>.<ref name="Gardner">{{cite journal|last=Gardner|first=G.H.F.|coauthors=Gardner L.W. & Gregory A.R.|year=1974|title=Formation velocity and density -- the diagnostic basics for stratigraphic traps|journal=Geophysics|volume=39|pages=770–780|doi = 10.1190/1.1440465 }}</ref> Suponiendo esto, la ecuación es reducida a:
 h Chinese (China) (zh-cn)其中<math>\rho </math>为体积密度,其单位为g/cm<sup>3</sup>, <math>V_p</math>为纵波速度,其单位为ft/s,<math>\alpha</math>和<math>\beta</math>是两个通过经验选取的常量,其数值依赖于地质情况。Gardner等提出当选取<math>\alpha = 0.23</math>和<math>\beta = 0.25</math>时,经验公式可以取得一个较好的匹配效果.<ref name="Gardner">{{cite journal|last=Gardner|first=G.H.F.|coauthors=Gardner L.W. & Gregory A.R.|year=1974|title=Formation velocity and density -- the diagnostic basics for stratigraphic traps|journal=Geophysics|volume=39|pages=770–780|doi = 10.1190/1.1440465 }}</ref>基于这样的假设,Gardner公式可以简化为: