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You could try doing the KE of that pillar erupting but it's probably not comparable to still water in density since it's being shot out so fast so you'd kinda have to assume a lot of stuff. But it is doable, just janky
At the bottom, in the Alternative Method to determine Richter Magnitude section. I noticed this part...
Magnitude at distance to Magnitude at origin
To do this knowing how far away from the origin we measured the Magnitude at distance is necessary. We call that distance r (unit should be km). To figure out how much the actual magnitude of the earthquake is we differentiate between 3 cases.
1. r < 60km: In this case the formula is (Magnitude at distance) + 0.0238*r = Richter Magnitude of Earthquake
2. 60 ≤ r < 700 km: In this case the formula is (Magnitude at distance) + 1.1644 + 0.0048*r = Richter Magnitude of Earthquake
3. r ≥ 700 km: In this case the formula is (Magnitude at distance) + 6.399 + 1.66*log10((r/110)((2π)/360)) = Richter Magnitude of Earthquake
What's the difference between each of the 3 cases is each for if you don't know the exact distance, so for anything 60km and under you'd use the first and so on an so fourth? I'm asking because I'm trying to do an Earthquake calc on my own but the size of the city that was shook is unknown.