Chapter 176
Top panel
Mount Elbrus has a prominence of 4741 m = 253 px
Top part: 88 px = 1649.04347826 m
Bottom panel
Top part: 399 px
Explosion radius: 317/2 px = 655.071156151 m
Yield
655.071156151^3*((27136*1.37895+8649)^(1/2)/13568-93/13568)^2 = 22591.8058287 Tons of TNT (Town level)