The last one in 1883 blew up 2/3rds of the island.
That one went on from May till August before the grand finale.
BTW, the concusion from that one went around the world seven times. It dropped the temps by 2 to 3 degrees worldwide.
Tambora, dropped them by about 5 degrees. Tambora, I believe, was a VEI 7? Gotta check. I dunno what the VEI index was for the “parent” of this one.
“The last one in 1883 blew up 2/3rds of the island.”
Yes. If you look at the photos at the top of the thread, those islands around the volcano are actually remnants of the caldera that blew then.
Interesting comparative table, here:
https://en.wikipedia.org/wiki/Mount_Tambora
(scroll down)
Krakatau’s VEI was 6, however, it’s ash column went up to an astonishing 80 km. Tambora was “only” 43 km. Also, it appears Krakatau was heard much further away.
https://en.wikipedia.org/wiki/1883_eruption_of_Krakatoa
Reading further, I found that duration of the explosion is a factor in determining VEI.
https://en.wikipedia.org/wiki/Volcanic_Explosivity_Index
My guess is that the peak intensity of the explosions at Krakatau was higher than at Tambora, but Tambora’s bursts were more sustained, ejecting more material in total.