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Grímsvötn volcano
Caldera 1725 m (5,659 ft)
Iceland, 64.42°N / -17.33°W
Current status: restless (2 out of 5) Grímsvötn volcano eruptions:
ca. 1310, 1332, 1341, 1354(?), ca. 1370, ca. 1390, ca. 1430, ca. 1450, ca. 1470, ca. 1490, ca. 1510, ca. 1530, 1598, 1603, 1619, 1629, 1638, 1659, 1681, 1684-85, 1706, 1716, 1725, 1753, 1768, 1774, 1783-85 (Laki fissure eruption: the largest historically known effusive eruption), 1794(?), 1796(?), 1816, 1823, 1838, 1854, 1861(?), 1867, 1873, 1883, 1887-89, 1891-92, 1897, 1902-04, 1922, 1933, 1934, 1934, 1938, 1939(?), 1941(?), 1945, 1948(?), 1954, 1972(?), 1983, 1984(?), 1996, 1998, 2004 (Nov.), 2011 (21-26 May)
Typical eruption style:
Effusive, explosive magma-water/ice reaction. 
Produces notorious and frequent floods of melt-water bursts from the glacier (jökulhlaups).

News from Grímsvötn volcano, Iceland:

Grimsvötn volcano (Iceland): eruption ending

Thu, 26 May 2011, 05:21
05:21 AM |
The eruption at Grimsvötn that started off violently last Saturday 21 May seems to be ending (or at least pausing) as ash emissions have dropped to near zero this morning.
What is left of the ash plumes that had affected northern Europe is now dissipating and European airspace is again fully open.
Previous news
Wed, 25 May 2011, 08:25
The ash plume from the Grimsvötn eruption has now reached northern Germany, forcing hundreds of flights in and out Hamburg and Berlin to be cancelled today (25 May). ... read all
Tue, 24 May 2011, 07:43
The explosive eruption of Grimsvötn volcano continues, but the height of the ash plume has significantly dropped and is estimated 5-7 km this morning 24 May. read all
Mon, 23 May 2011, 06:29
The ash plume from the large and still ongoing subglacial eruption of Grimsvötn volcano has caused heavy ash fall and shredded much of the country in darkness over the weekend. At the moment, most flights to and from Iceland are cancelled. ... read all
Sun, 22 May 2011, 04:41
A new eruption started at Grimsvötn volcano, located under the Vatnajökull icecap late on 21 May yesterday evening at around 17h15 local time. ... read all
Wed, 3 Nov 2010, 16:47
Signals of a possible impending eruption at Grimsvötn volcano under the icecap of Vatnajökullremain remain uncertain. Scientist measured an increase in seismic tremor at Grimsvötn, probably caused by the meltwater flow increase, but no volcanic tremor. The composition of the meltwater indicates that much of the water has been melted caused by increased geothermal heat flow. No other signs of an impending eruption are detectable (so far). ... read all

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