I was trying to find the amount of energy created during a volcanic explosion, I have been looking around, There was one formula I found where I could use the Kinetic Energy, which is $KE=\frac{1}{2}mv^2$, but I feel that there is something more.
I am looking at Volcanic Explosivity Index for Krakatoa, which says that it is class 6, and it has a TNT equivalence to 200 megatons.
I was hoping if someone can give me the correct calculation to find the means of measuring a volcanic explosion in joules, tonnes or higher.
Or if there are other means or formula like finding the result in newtons, go ahead with that as well
https://en.wikipedia.org/wiki/Volcanic_Explosivity_Index https://en.wikipedia.org/wiki/1883_eruption_of_Krakatoa
Here is information about the Volcanic Explosivity Index
https://geology.com/stories/13/volcanic-explosivity-index/
It says you can measure it by volume of volcanic material, height of eruption column and duration of explosion.