The feat:
Mortal Kombat Deception - Intro HD
Basically, Raiden "sacrificed" himself trying to stop Onaga. Although the blast had little effect on Onaga.
Take in mind that there isn't a better quality for the video, nor info about the temple, etc. Also, i'm gonna make a few assumptions due to the lack of info + good scans.
Calculation[]
First of all, what is Onaga's height??
Well... no one knows. IIRC Onaga is the second tallest character only below Blaze but above Goro/Kintaro (when they are easily above like 90% of the cast in height). So, i'm going to assume that he is at least 2 meters tall (which is likely higher than that).
Onaga's height = 2 meters = 15 Px
Entrance of the temple = 30 Px = 4 meters
Entrance of the temple = 12 Px = 4 meters
Temple's height = 96 Px = 32 meters
Temple's length = 660 Px = 220 meters
Now, trying to get the width...
Lets Angsize!
A few things:
1) I've found in a couple of pages that Raiden's height is 2.07 meters tall, which i'm not sure due to the fact that doesn't have any source. So, i'm going to assume that he is 1.80 meters tall.
2) The POV of the image that i use for the angize is approximately half of the distance between Raiden and the entrance.
7 Px = Raiden's Height = 1.80 meters
293 Px = Panel Height
2*atan(tan(70/2)*(Object height/Panel height))
2*atan(tan(70/2)*(7/293)) = 1.916766997388 degrees
Using the angular size calculator, I got a distance of 53.8 meters
Therefore the distance betweem Raiden and the entrance is 107.6 meters
Temple's width = 107.6 meters
I got a total volume of 757504 M3 or 757504000000 Cm3
EDIT: Due to Alakabamm suggestion i will add 95% of hollowness as a Low end, 90% as Mid end and 80% as High end
Where 95% Hollowness = 37875200000 Cm3
90% Hollowness = 75750400000 Cm3
And 80% Hollowness = 151500800000 Cm3
I will be using Rock values due to that looks like to be an old temple, i mean just to be on the safe side, i guess.
Low End[]
Fragmentation of Rock = 8 (j/cc)
E = 37875200000 * 8 (j/cc)
E = 303001600000 J or 72.42 Tons or City Block level
Violent Fragmentation of Rock = 69 (j/cc)
E = 37875200000 * 69 (j/cc)
E = 2613388800000 J or 624.61 Tons or Multi-City Block level
Pulverization of Rock = 214.35 (j/cc)
E = 37875200000 * 214.35 (j/cc)
E = 8118549120000 J or 1.94 Kt or Small Town level
Mid End[]
Fragmentation
E = 75750400000 * 8 (j/cc)
E = 606003200000 J or 144.84 Tons or Multi-City Block level
Violent Fragmentation
E = 75750400000 * 69 (j/cc)
E = 5226777600000 J or 1.24 Kt or Small Town level
Pulverization
E = 75750400000 * 214.35 (j/cc)
E = 16237098240000 J or 3.88 Kt or Small Town level
High End[]
Fragmentation
E = 151500800000 * 8 (j/cc)
E = 1212006400000 J or 289.68 Tons or Multi-City Block level
Violent Fragmentation
E = 151500800000 * 69 (j/cc)
E = 10453555200000 J or 2.49 Kt or Small Town level
Pulverization
E = 151500800000 * 214.35 (j/cc)
E = 32474196480000 J or 7.76 Kt or Town level