Talk:Supervolcano
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[edit] Armageddon
So there's this link in the ext link section
which I'm going to remove. I thought I should be extremely specific about why. The linked article is a short intro to Super Volcanos as an engine of Armeggedon. This makes sense because it's on an Armeggedon website, where a brief and deliberately menacing article makes sense. But the text is not useful in the Encyclopedic sense of being useful to someone who wants to know the generally accepted understanding of what is a supervolcano is in the context of Geology. As an example, the linked article's description of what is a supervolcano provides such a broad definition that it fits pretty much every volcano in the Cascade Range. -- Cjensen 00:12, 16 Oct 2004 (UTC)
- I do not dispute the removal of this link. - Gilgamesh 03:48, 16 Oct 2004 (UTC)
The Supervolcano dramadoc probably needs a separate article fleshing out the cast and plot a bit. Lee M 00:53, 24 Mar 2005 (UTC)
[edit] I agree with the author
That it is better suited to be listed on a armegeddon site for that topic, but in an encyclopedia I agree that it is more like and apart of the cascade ridge and should be listed here for that purpose. Armageddon could use links to this as maybe a future concern. That would include some other possible places. The conclusive proof that this will happen here again and the outcome from it is nonconclusive. So I agree with the author removing that article for this listing. I agree.
- Note: indenting paragraphs causes them to become boxed and unwrapped, causing lots of horizontal scrolling, as in this case (now fixed). Please avoid! And please sign posts if you're a member! Lee M 01:09, 25 Mar 2005 (UTC)
[edit] Eruptions
"VEI-8 eruptions are not so great as to form mountains, but instead circular calderas, resulting from the downward collapse of land at the eruption site to fill emptied space in the magma chamber beneath." I'm not happy about this statement at all. It implies that if the eruption were somehow 'greater' they would form mountains. You don't get much 'greater' than a class of volcanic eruption STARTING at 1000km3 of ejecta. Mountains are formed through entirely different geological processes to these volcanos which leave large calderas. Even if the author were thinking of a volcanic cone or stratovolcano the 'greatness' of the eruption has nothing to do with it.
[edit] 1cm of ash?
I looked this up after my science teacher was discussing the subject with us today, and he said it was more likely to be 1m of ash covering North America, not 1cm. I'm not sure if this is accurate or not but he is the sort of person who knows what he's talking about. Antoher thing to add is that the volume of ash would be so great it would probably plunge the rest of the world into around 2 months of darkness. Can anyone verify this?
- "Even the US East Coast could be paralysed by 1cm of ash", according to the BBC website pages accompanying the programme. (I do find that a surprisingly low figure, though, given that according to the Lake Toba article, "although the (Toba) eruption took place in Indonesia, it deposited an ash layer approximately 15 cm (6 in) thick over the entire Indian subcontinent.") Vilĉjo 13:20, 13 May 2006 (UTC)
If the eruption was a full scale one it would certainly bury vast areas around the eruption site with ash and lava hundereds of feet thick and most definitely cover a vast area of the United States with ash depths of about 1cm or more. Also if the eruption was large enough and enough sulfur was emitted into the atmopshere (say 2000-4000 megatons) then it could repeat the Lake Toba incident and create a millenium of freezing.
- As to the thickness, the largest Yellowstone eruptions did not cover all of North America with ash - the most distant confirmed ash from Yellowstone is, I believe, in the state of Mississippi where it is something less than an inch (<2 cm) thick. This is not to say that it would not have caused a problem all over the continent; it very likely would have. Geologyguy 15:29, 28 January 2007 (UTC)
[edit] Bruneau-Jarbidge event
At present, the Bruneau-Jarbidge eruption is listed on this page as a VEI-8 volcanic event. It was brought to my attention that it wasn't listed in any publications as an event of that size. From the Bulletin of Volcanology, I found this:
| “ | Equally, the long-lived Yellowstone-Snake River Plain "hotspot" province (Smith and Braile 1994) has an extensive ash-fall tuff record suggesting that it has experienced many tens of eruptions with volumes in excess of 250 km³ over the past 16 Ma (Perkins and Nash 2001). Volumes of associated major ash-flow tuffs have, however, only been determined for deposits of the past 8 Ma (Morgan et al. 1984; Christiansen 2001). It is likely that several large volume eruptions associated with the earlier stages of the province, between 16 and 10 Ma, remain to be identified. | ” |
Is there any other information out there about these older eruptions? – Swid (talk | edits) 18:31, 9 August 2006 (UTC)
[edit] I think Siberian super volcano should be mentioned too.
This a link on Discovery channel: [1]
- The article says "For large igneous province eruptions, see that article.". Supervolcano is a poorly defined term. -- Cjensen 22:18, 12 September 2006 (UTC)
[edit] Under water super volcanos?
Since 3/4 of the planet is covered by oceans, shouldn't there be super volcanos under the oceans? Is there any information about this? --Serge 18:05, 27 September 2006 (UTC)
- Most submarine volcanos are located away from continental crust, so the chemical composition is different and the lava tends to be basalt which is not prone to explosive eruption like Stratovolcanos are. So the best a hot spot can do is create an island like Hawaii. -- Cjensen 23:19, 29 September 2006 (UTC)
[edit] List of doomsday scenarios
Could use votes to save this article, thanks MapleTree 22:39, 28 September 2006 (UTC)
