OK..I looked and Krakatoa was a 6.
So if this one registers officially at a 6, we have a eruption as large as that and Pinatubo.
The Professor appears right..if that thing was largely above water...
Southern hemisphere will see effects. Interesting to see the weather down that way this coming winter.
The blast pressure wave rotated the earth more than once. The pressure wave first hit the US west coast going west to east. Then some hours later the pressure wave hit the east coast going east to west. Amazing info.