Saitama = 53 px = 1.75 m
Width of arena = 748 px = 24.7 m
Third image:
Saitama's head = 7 px = 21 cm (head ~ 1/8 of height)
thickness of arena = 70 px = 2.1 m
Volume of fragmentized part of arena = half length*width*thickness
V = 12.35*24.7*2.1
V = 640.6 m^3
fragmentation energy = 8 j/cc
E = 5124800000 Joules (1.2 Tons of TNT) Building level+
The feat on the third image resulted in at least 25 kg TNT (Small Building level) and i'm not sure about cutting feats like the one on the first image so i won't bother with it.
All in all Suiryu is at least Building level+