Talk:Hekla

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[edit] Hekla is a stratovolcano

Hekla is a stratovolcano, not a tuya (as this page was changed to read). See this page |Global Volcanism Program: Hekla Summary for confirmation, which is a reliable volcanological source published by the Smithsonian.

The cone of Hekla is built up of overlapping lava flows and pyroclastic deposits, which pretty much fits the exact definition of stratovolcano. It did not erupt subglacially, as a tuya must. There do not appear to be any reliable reference sources which state that it is a tuya. Thanks. Seattle Skier 08:01, 28 February 2007 (UTC)

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— Save_Us † 09:56, 17 January 2008 (UTC)

[edit] Bronze Age eruption

I have a source stating unequivocally that Hekla's eruption in 1159 BC had a catastrophic effect on Bronze Age Britain - (see Timeline of prehistoric Scotland) - causing 18 years of bad weather. This is: Moffat, Alistair (2005) Before Scotland: The Story of Scotland Before History. London. Thames & Hudson. I presume this is the same eruption that the Smithsonian reference has as "950 BC(?)". From the reference section Moffat is probably quoting Steven Mithen's (2003) After the Ice, but I don't want to use an historian to correct a geological site without access to a primary source. Ben MacDuiTalk/Walk 15:30, 24 February 2008 (UTC)

I have a major rewrte of this article on a subpage of mine (that I could really do with getting round to finishing). The agreement between sources on Hekla's ancient eruptions doesn't seem great, I currently have 3 dates for this eruption in the same paragraph, 2 of which are pretty much the same. Anyway if you have a look at User:JMiall/Hekla you can see there's a reference givng 1120±50 BC. I'd be tempted to go with this one just because it gives an uncertainty. JMiall₰ 00:52, 25 February 2008 (UTC)
OK - I'll leave you to update the article - just so long as I am not out badly of line on the Timeline of prehistoric Scotland. Thanks. Ben MacDuiTalk/Walk 13:10, 25 February 2008 (UTC)
There's some discussion of the uncertainty surrounding the date of this eruption in "Excavating words: a geological tool; human histories unravel geological mysteries" by Stefi Weisburd, Science News, 9 Feb 1985. This article quotes two Californian researchers (Pang and Chou) as settling on a eruption date of 1100 B.C., with an uncertainty of +80 years and -60 years, after considering ice-core, radiocarbon and historical dates. This is quite similar to the 1120±50 BC range, and the source cited in User:JMiall/Hekla does seem to refer to Pang's work. (I can't seem to download the full document, so I'm not entirely sure.) -- Avenue (talk) 12:54, 25 February 2008 (UTC)

So, you guys are actually thinking about changing a 950 BC eruption date that has been established in the scientific literature based on 1) a 1985 news story where some guys are speculating about simply "moving" a radiocarbon date to match their own historical theories and 2) on unreferenced lecture notes put up by some unknown unaffiliated guy who runs a catastrophe website? Neither one is a reliable source in any possible universe. Stuff like this is why Wikipedia has no credibility. GVP Webmaster (talk) 20:18, 26 February 2008 (UTC)

Personally I'm happy to put in whatever there is a good citation for. At present the article cites GVP which gives a date of '950 BC ?' with no other information about how well established this is. I have not looked into this in detail other than sticking both dates in my draft article for now but if you have easy access to good, preferably peer reviewed journal or book, references for 950 could add them to the article or post them here? JMiall₰ 02:08, 27 February 2008 (UTC)
The GVP website does give a long list of sources, but it's not obvious to me from their titles which would be a source for the 950 BC date. My comment above aimed to add to what we knew about the source of the 12th century BC eruption dates. I agree the two sources we have so far for this don't seem very strong. -- Avenue (talk) 02:46, 27 February 2008 (UTC)