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Halfgrandcanyon

Method 1

According to this site, the Grand Canyon has a volume of 4.17 trillion meters^3. Converting it to cubic centimeters makes it 4.17*10^18 cm^3.

Half of that is: 4.17*10^18 / 2 = 2.085*10^18 cm^3

In the image shown above, the debris were small that a lot of small debris are even smaller than the repulsors itself. So let's use v. fragmentation:

2.085*10^18 cm^3 * 69 = 1.43865*10^20 joules or 34.384 gigatons of TNT (Island Level)

Method 2

According to the Wikipedia, Grand Canyon is 446 km long, is 29 km wide and has a depth of 1.9 km. Multiplying them (v = l*w*h) will contribute into a volume of 24575 km^3. Converting it to cubic centimeters makes it 2.46*10^19 cm^3.

Half of that is: 2.46*10^19 / 2 = 1.23*10^19 cm^3

In the image shown above, the debris were small that a lot of small debris are even smaller than the repulsors itself. So let's use v. fragmentation:

1.23*10^19 cm^3 * 69 = 8.49*10^20 joules or 202.916 gigatons of TNT (Large Island Level)

Conclusion

So either Island Level or Large Island Level AP for one of Iron Man's weaker armors. Not to mention his Extremis armor is far stronger and more advanced. Personally, I prefer Method 2.