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Subglatial volcanoes of Iceland
amgumen
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1-23-2008 7:18 PM
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tags:
volcanoes
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geology
,
environment
,
climate change
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1-23-2008
8:18 PM
Antara
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/472e5e48-9745-402e-9ac9-c9d444ea7780/97477C82-04BB-4322-8262-DFC040653671/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.vulkaner.no/v/volcan/grimsvot-e.html" href="http://www.vulkaner.no/v/volcan/grimsvot-e.html" style="font-size: 11px;">www.vulkaner.no</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"> Grimsvotn volcano (N 64.41°, W 17.33°), situated near the center of the Vatnajokull ice cap in central Iceland, is one of Iceland's most active volcanoes. It has a complex of calderas, and a subglacial caldera lake sustained by geothermal heat. Small eruptions have occurred at the volcano in 1983 and 1998 (around 0.1 km3). In 1996, the Gjalp subglacial eruption occurred north of the volcano. The most recent eruption triggered by a pressure release as the current eruption occurred in 1934.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"> Vatnajökull covers an area of 8.100 km². The volume of the icecap is almost 3.000 km³. The icecover is about 400 m thick (average), and at the most about 950 meters! Since 70 % of the surface is above 1.100 m asl, it is still alive.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html">The eruption at Grimsvötn volcano ceased between Friday night and Saturday morning,<BR /><DIV> November 6, 2004.</DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.vulkaner.no/img/2184BC81-6689-4ED8-BCB7-1AE7D81F0DFC" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><FONT size="2" face="Arial, Helvetica, sans-serif" color="#990000">Grimsvötn crater on November 5th.</FONT></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.vulkaner.no/img/6CA14D0D-7616-49F0-A72C-D2BEFC5CDED4" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><B>November 5th, 2004</B></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"> An explosion in the morning of November 4th.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.vulkaner.no/img/7E901144-3859-4C50-9A41-C10DAF337863" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><FONT size="2" face="Arial, Helvetica, sans-serif" color="#990000">A second cauldron near Grimsvötn.</FONT></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.vulkaner.no/img/14DB279E-881D-41E7-85AE-876A249148DC" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><FONT size="2" face="Arial, Helvetica, sans-serif" color="#990000">In the morning of November 2nd </FONT></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><B>2.november 2004</B></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.vulkaner.no/img/89F0CE5E-D7E4-4FFA-BD79-E966EAA0DD47" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.vulkaner.no/img/816137C6-68DF-4337-B8F5-192913381FE8" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.vulkaner.no/img/152216E5-3C48-4B31-B421-ABF3F7A8CB72" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.vulkaner.no/img/B209486D-004B-4244-9244-540252D709F5" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.vulkaner.no/img/0B27AEC6-B274-40F2-93DA-AE89BBD1542A" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.vulkaner.no/img/70509E5B-6AD0-4319-BC49-C013566F25FD" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.vulkaner.no/img/181BDA70-EF39-4299-95AE-34D2222942E3" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.vulkaner.no/img/FFD64AAB-551C-4BF9-A06B-5F054C368A51" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.vulkaner.no/img/6AAB6E60-957D-4BE9-8B12-0E07BF2E74A5" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.vulkaner.no/img/71F7D656-44B3-4F1A-B37D-211A81652169" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content8.clipmarks.com/blog_cache/www.vulkaner.no/img/96BDF557-2A5A-47E0-8FD1-502DDA941A8D" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content9.clipmarks.com/blog_cache/www.vulkaner.no/img/C0E7BC78-3BB5-4A02-BB67-F643A149EB27" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.vulkaner.no/v/volcan/grimsvot-e.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/www.vulkaner.no/img/D660F078-A287-4AE0-8450-E957A19ACC94" alt="" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; 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