Answer
$188$ $decibels$; yes, it can rupture a human eardrum.
Work Step by Step
$$D(I) = 10\log(10^{12}I)$$ $$D(6.3 \times 10^{6}) = 10\log(10^{12}(6.3 \times 10^6))$$ $$D(6.3 \times 10^6) = 10\log(6.3 \times 10^18) \approx 188$$ Since the decibels produced by a blue whale are greater than 160, it can be said that a human eardrum can rupture at close range.
