Introduction[]
I'm assuming this explosion was at LEAST in the troposphere which is the lowest region of the earths atmosphere, this is because we can see the earths curve in the scene
Values[]
Distance is 17km
2atan(tan(70/2)*(90/143)) = 33.209694465335 degrees
Size of explosion = 10.139 kilometers
Y = ((10.139/0.28)^3)/1000 = 47.4800617538 Megatons of TNT (City level, 7-B)
Final Result[]
Sonic Survives an explosion = 23.74 Megatons of TNT (City level, 7-B)