I heard an initial estimate (sorry, nothing solid yet) that it was VEI 4 or 5, so more like every 10 years. https://en.m.wikipedia.org/wiki/Volcanic_Explosivit

I heard an initial estimate (sorry, nothing solid yet) that it was VEI 4 or 5, so more like every 10 years. https://en.m.wikipedia.org/wiki/Volcanic_Explosivity_Index https://en.m.wikipedia.org/wiki/Volcanic_Explosivity_Index https://pubs.usgs.gov/gip/msh/comparisons.html https://pubs.usgs.gov/gip/msh/comparisons.html