Eruptions

At the Smithsonian Institute site they say, "Frequent explosive eruptions during the past half century have increased the height of the summit significantly above that shown on current topographic maps and have kept the upper part of the volcano unvegetated."

I'd be interested to have an idea how many eruptions it takes to grow a volcano. I know some volcanoes grow from growth inside the earth - particularly I am thinking about some Island volcanoes that grow from beneath. Do large volcanoes then grow mostly from material being spouted from the top vent? Are there any formulas for height of volcanoes to historical events?

Posted by: Thomas Donlon | December 13, 2009 6:46 PM

Hi Bruce,

I am not sure. There was one volcano whose name I forgot and I just spent about ten minutes trying to find it through Google but couldn't. Anyway this volcano although not very active has risen a lot since Captain Cook landed on it. The spot he landed is now many meters higher due to the growth of the otherwise quiet volcano.

Also Anak Krakatau I think is growing (in part) from being pushed up from below. So I guess I am thinking of inflation of an existing volcano. I am not yet sure what "diapir" is. The link you provided was helpful to show the growth of a little volcano. I'll give some more thought to large volcanoes and how long it takes them to grow. I am pondering if I should think of a linear growth by height or by volume in considering the growth over time of a large volcano. If a volcano is growing by mass ejections, then its height will grow faster at the onset than later.

I appreciate your helpfulness Bruce.

Posted by: Thomas Donlon | December 14, 2009 10:32 AM

Hi Thomas,

I wouldn't call Bagana a small volcano. It's 1750 meters tall (5700 feet). The GVP says that "Bagana is a massive symmetrical, roughly 1750-m-high lava cone largely constructed by an accumulation of viscous andesitic lava flows. The entire lava cone could have been constructed in about 300 years at its present rate of lava production."
That's pretty impressive growth by any account.

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