The average density of Earth’s crust $10\ km$ beneath the surface is $2.7\ gm/cm^3$ . The speed of longitudinal seismic waves at that depth is $5.4\ km/s$ . The bulk modulus of Earth’s crust considering its behaviour as fluid at that depth is
Medium
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$v = \sqrt {\frac{B}{\rho }} $
$B$ = $\rho v^2$ = $5.4^2 × 10^6 × 2.7 × 10^3$
= $7.9 × 10^{10}\ Pa$
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