Thread:DMUA/@comment-31118677-20181208021647/@comment-31165326-20181208023322

Alright, I'll help you.

Basically, Earthquake calculations usually work by calculating the magnitude of the earthquake from the furthest distance it's shown to be felt at. Said distance is represented by r in the formulas to follow.

If the distance is less then 60 Kilometers, you use (Magnitude at distance) + 0.0238*r, which equals the Richter Magnitude of the Earthquake.

If it's more then 60 Kilometers but less then 700 Kilometers, you use (Magnitude at distance) + 1.1644 + 0.0048*r = Richter Magnitude of Earthquake

If it's exactly or more then 700 Kilometers, you use (Magnitude at distance) + 6.399 + 1.66×log(10(r/110)×((2×π)/360))

Once you have magnitude, you have two options as per formula, either Radiated Waves or Total Seismic Energy. Radiated Waves are used for just the earthquake, when all the character is doing is just causing the earth to shake. Total Seismic Energy is when the character is causing the tectonic plates to move in order to create such an impact. The standard assumption is just Radiated Waves.

For Radiated Waves, it's 10^(1.5*(Richter Magnitude)+4.8)

For Total Seismic Energy, it's 10^(1.5×Richter Magnitude)×10^9.091