Calc Gurren Lagann - Dai-Gunkai explodes

Recalcing an old calc that the images are unfortunately no longer with us for.
Dai-Gunkai explodes, causing a colossal explosion that Dai-Gurren, Gurren Lagann, Team Dai-Gurren and Viral all survive. Dai-Gurren is 293.076316m long.
21 pixels = 293.076316m
1 pixel = 293.076316m/21 = 13.956015m
13.956015m X 1107 = 15449.3086m
15449.3086m/2 = 7724.6543m
13.956015m X 656 = 9155.14584m
13.956015m X 461 = 6433.72292m
13.956015m X 1470 = 20515.342m
20515.342m/2 = 10257.671m
13.956015m X 1361 = 18994.1364m

The cap and the column overlap a bit, but given there's more to the cap cut off above, it should balance out. Volume as an ellipsoid for the top part and a cylinder for the bottom part.

V = 4/3πabc
= 4/3 X π X 6433.72292 X 10257.671 X 10257.671
= 2.83562302e12m^3

V = πr^2h
= π X 7724.6543^2 X 9155.14584
= 1.71622113e12m^3

As for the mass, for the vaporous looking cap we'll use the mass of air (1.003kg/m^3) and the mass of the column as water (1000kg/m^3).

M = 2.83562302e12 X 1.003
= 2844129889060kg

M = 1.71622113e12 X 1000
= 1.71622113e15kg

M = 2844129889060kg + 1.71622113e15kg
= 1.71906526e15kg

Next we need the timeframe.
Timeframe is 7 seconds and 15 frames.

T = 1s/24
= 41.6666667ms X 15
= 0.625000001 + 7
= 18994.1364m/7.62500s
= 2491.03428m/s

Finally, we'll get our kinetic energy.

KE = (0.5)mv^2
= (0.5) X 1.71906526e15 X 2491.03428^2
= 5.33361639e21 joules
= 1.2747649115678776344 teratons

Final Results
Dai-Gunkai explodes = 1.275 teratons