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Wikipedia entry that disputes the volcanism possibility: http://en.wikipedia.org/wiki/Permian%E2%80%93Triassic_extinc... I guess the newer article has evidence that the eruption was much greater in size than previously thought.
I remember a couple of years ago, Yellowstone had a string of quakes. That caldera is still rising... :/
Here's a link to the article: http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo10...
You can't read it without a subscription, but you can view smallish versions of the figures. I really wish scientific research wasn't put behind paywalls. It seems antithetical.
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As an aside, that has always bugged me too, how scientific research is hidden from everybody. Scientific research seems (especially funded by the public through our universities) like the epitome of something that should be open and available for anyone to peruse. :|