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Formula for the distance of an earthquake

$d=\Delta t\frac{((\sqrt{k+4F/3\delta p})-(\sqrt{F/\delta p}))}{((\sqrt{k+4F/3\delta p})(\sqrt{F/\delta p}))}$where$d$=the distance of the earthquake, $\Delta t$=the difference in arrival times of the P and S waves, $k$=the ability of the rock to be compressed, $F$=the force exerted, $\delta$=the displacement, $\frac{F}{\delta}$=the rigitidy of the rock, $p$=the density of the rock, $\sqrt{\frac{k+4F}{3p\delta}}$=the velocity of the p waves, and $\sqrt{\frac{F}{\delta p}}$ is the velocity of the s waves.

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