So apparently in Tekken, Jack-6 manages to destroy and briefly hault the KE of a meteor, so we're gonna calc it. The metor is stated to be 6 miles in diameter and it has a spherical shape, so this is very easy to calculate. Here is a link to the feat in question.
Meteor Diameter = 6 Miles
Meteor Radius = 3 Miles = 4828.03 Meters
Volume of Meteor (Sphere) = 471409673000 Meters^3 = 4.71409673e+17 Cm^3
Fragementation of Rock is 8 Joules/CC
Fragmentation = (4.71409673e+17)*(8) = 901.36 Megatons (Mountain level+)
Speed of Atmospheric re-entry is 11,000 m/s
KE = (0.5)(471409673000)(11000^2) = 6.8 Gigatons (Island level)