I don't know that answer to that, but I will tell you something interesting about volcanic eruptions that is related to damage and size of eruptions. The kinds of eruptions that could do the most damage have not occurred in recorded history. For example, the eruption that made Long Valley, near Mammoth was 600 times larger than the 1980 Mt. St. Helens eruption and 60 times larger than the eruption of Mt. Pinatubo in the Phillipines.