Rumble III, a submarine volcano off the coast of New Zealand, has apparently erupted in a major way, but no indications of an eruption were found.
Weird. No seismograph data? Does the water hide detectable signals that much, then?
Apparently the summit crater has collaped into a caldera, which would be a major eruption; it's what happened at Mt. St. Helen's, and at Crater Lake long ago.
No pics with this one, for obvious reasons.
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It's also what happened at krakatoa, and the pretty much every major eruption.
A volcano can subsect (I think thats the term) where the main magma chamber in stead of erupting up, and out, simple spreads and grows beneath the crust, (kinda like if you unintentially pick at a zit when you are 13, and instead of popping it, you weaken the nearby skin letting it grow into a boil.) that's not common, but probably not a cool thing if the chamber still has a significant amount of pressure.
You want pictures? The only one I can find:
http://tinyurl.com/ad999x
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