Hm… this is a long arc; well over 100 chapters, so I’ll have to divide it up between many parts, I think.
Jidanbo Axe Slash
Jidanbo’s axe hits the ground hard enough that it fractures and the debris shoots up high enough so that the others can no longer see Ichigo.
Jidanbo is 9.88 m tall. He measures 464 pixels here compared to 650 for diameter of fractured rock. The depth of fractured rock is 92 pixels.
650 / 464 = 1.401 * 9.88 = 13.842 m, diameter of fractured rock.
92 / 464 = .198 * 9.88 = 1.956 m, depth of fractured rock.
Treating this as a dome, the volume would be 151.09 m^3. This is a fracturing of rock, so 8 J/cc is the figure we’ll be using.
151.09 m^3 = 151,090,000 cm^3
151,090,000 * 8 = 1,208,720,000 J, or 288.891 Kg of TNT
Ichigo blocked 10 of these shots in a row after Jidanbo performed this feat.
Ichigo Destroys Jidanbo’s Axes.
With a casual swing of his sword, Ichigo shatters both of Jidanbo’s axes.
I’m going to cut this axe blade up into two shapes. A triangular prism and rectangualr prism. The closest part to the edge is the triangular prism while closer to the handle will act as the rectangular prism. Ichigo is 1.74 m tall. He’s 151 pixels here compared to 132 for length of blade (Ignore the 38 px, found out later it wasn’t needed) while the cut off from the triangular prism is 73 pixels long and 25 wide.
132 / 151 = .874 * 1.74 = 1.521 m, length of triangular prism.
73 / 151 = .483 * 1.74 = .84 m, length of rectangular prism.
25 / 151 = .166 * 1.74 = .289 m, width of rectangular prism.
Length of blade is 384 px compared to base of triangle shape at 122 and thickness of the end at 38.
122 / 384 = .318 * 1.521 = .484 m, base a and b of triangular prism.
38 / 384 = .099 * 1.521 = .151 m, thickness.
For the triangular prism, the volume comes out to 55,580.382 cm^3. For triangular prism, 36,656.76 cm^3
55,580.382 + 36,656.76 = 92,237.142 cm^3
Ichigo destroyed 2 axes, so…
92,237.142 * 2 = 184,474.284 cm^3
Ichigo fractured iron or steel, so that means our energy figure is 96 J/cc.
184,474.284 * 96 = 17,709,531.264 J, or 4.233 Kg of TNT.
Sado’s Crater
Sado makes a crater after falling into Soul Society. The implication seems to be that he punched the ground to cushion his landing. A weird way of doing things, but hey, whatever works. lol
I am going to assume an average Japanese male height of 1.70 m for the Shinigami. He measures 72 pixels compared to crater diameter at 380.
380 / 72 = 5.347 * 1.70 = 9.09 m, diameter of crater.
If we were to treat this as a perfect half-sphere, the volume would be 196.635 m^3.
Since this is an obvious case of cratering, we’ll use 87 J/cc to find energy.
196.635 m^3 = 196,635,000 cm^3
196,635,000 * 87 = 17,107,245,000 J, or 4.089 Tons of TNT.
Hinamori’s Shikai
Hinamori’s shikai creates a decent sized explosion. There is a visible shockwave by the fence in the top panel of the second scan, so I’ll be treating it as a high explosive. That would make the detonation velocity 3,000 m/s.
Gin is 1.85 m tall. He’s 25 pixels here compared to 187 for diameter of the explosion.
187 / 25 = 7.48 * 1.85 = 13.838 m, diameter of explosion.
That would make the radius 6.919 m.
Using the radius and our detonation velocity of 3,000 m/s, we can get a time frame.
6.919 / 3000 = .0023 s, time frame.
From here I’ll use the Taylor Formula to get a yield for the explosion.
E = 8*pi*p*R^5 / [75(y-1)t^2]
Where p is density of the air, t is time after explosion has formed, R is radius of the explosion. y is specific heat ration (Will be using 1.4 here as is common)
8 * 3.14 * 1.2 * 6.919^5 / [75(1.4 – 1).0023^2] = 3,011,900,408.436 J, or 719.862 Kg of TNT.
RESULTS
Jidanbo Axe Slash – 288.891 Kg of TNT
Ichigo Destroys Some Axes – 4.233 Kg of TNT
Sado Makes a Crater – 4.089 Tons of TNT
Hinamori’s Shikai – 719.862 Kg of TNT
Cable's Calculations 