Katara Freezes Zuko during Full Moon (Book 1)[]
Katara = 88 px = 1.4452 mts (But I'll use 1.3452 since she isn't standing stright)
Width = 119.331471 px = 1.82414426 mts
Lenght = 423.757006 px = 6.47770369 mts
Height = 388 px = 5.93110909 mts
Volume = ((6.47770369*5.93110909)/2)*1.82414426 = 35.0417814 m^3
Mass = 35041.7814 kgs
Q1 = specific heat capacity*mass*(delta temp.) => 4186*35041.7814*25 = 3.66712242e9 J
Q2 = Latent Heat of Fusion (Heat of fusion of ice is 334000 J/kg) => 35041.7814*334000 = 1.1703955e10 J
Energy = 15371077420 J or 3.67377567 Tons of TNT = Large Building level
Likely Scales to Firebenders like Zuko, Azula, Iroh and Ozai during Sozin's Comet.
Iroh's Lightning Destroys a Wall (Book 2)[]
Zuko = 403.608721 px = 1.5345 mts
Height = 477 px = 1.81352994 mts
Width = 568 px = 2.15950735 mts
Thickness = 33.2415403 px = 0.12638266 mts
Volume = 0.12638266*2.15950735*1.81352994 = 0.494956359 m^3 or 494956.359 cm^3
Energy (Violent Fragmentation of Rock) = 494956.359*69 = 34151988.8 Joules or 8.16252122 kgs of TNT = Small Building level
Aang's Airbending (Book 2)[]
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Aang = 219.825309 px = 1.3716 mts
Black = 45.3982379 px = 0.283262302 mts (Later, you'll understand)
Yellow = 550 px = 3.43172496 mts
Area of a circle = pi*r^2 = pi*(3.43172496/2)^2 = 9.24942698 m^2
According to this, tensile strength of rock is between 8-20 MPa, so as a mid-end, I'll use 10 Mpa (1*10^7 N/m^2). Shear Force = 0.6*Tensile Strength times shear area; work = force*distance (2r), so the Shear Energy required is:
SE of cutting the top of the rock = 0.6*1e7*9.24942698 = 55496561.9
Energy = 55496561.9*3.43172496 = 190448937 Joules = 45.5183883 kgs of TNT (Small Building level)
Scales to... Well, pretty much every bender's durability, since they showed to be able to take Aang's Airbending
Aang's Earthbending (Book 2)[]
Green = 70 px = 3.43172496 mts
Blue = 652 px = 31.9640667 mts
From deepness, I'll use height plus his arm, since he has to fully straight to get out
Volume = ((pi*h)/6)*(3*r^2+h^2) = ((pi*(0.283262302+1.3716))/6)*(3*(31.9640667/2)^2+(0.283262302+1.3716)^2) = 666.338871 m^3 or 666338871 cm^3
Energy = 666338871*8 = 5330710968 J or 1.2740705 Tons of TNT = Building level+
Scale to Toph and King Bumi.