1 mag 8 = 1,000,000 of mag 4 https://en.wikipedia.org/wiki/Richter_magnitude_scale#Richter_magnitudes https://en.wikipedia.org/wiki/Richter_magnitude_scale#Ric

1 mag 8 = 1,000,000 of mag 4 https://en.wikipedia.org/wiki/Richter_magnitude_scale#Richter_magnitudes https://en.wikipedia.org/wiki/Richter_magnitude_scale#Richte... On top of that major quakes happen deep below, not where humans do their thing.