Mystery Volcano Photos #7-8: Arenal and Eyjafjoll

So, the field still stands unblemished, having identified all 8 MVPs, usually within less than 7 tries. Nice job!

Current MVP Standings:
volcanista - 1
Elizabeth - 1
Ralph - 1
gijs - 1
Anne - 1
Cam - 1
gg - 1
The Bobs - 1

MVP #7 was Arenal in Costa Rica. It was initially going to be Rincon de la Vieja, but somehow I mixed up the pictures. I think a lot of you know a lot more about Arenal than I do, but it is one of the most active - and easily visited - volcanoes in the Western Hemisphere.

Eyjafjöll volcanoHekla from the northwest in Iceland, not your MVP #8.

MVP #8 was Eyjafjöll (or Eyjafjallajökull, although the last one is technically the name of the glacier on the volcano) in the south of Iceland. Iceland is filled with these volcanoes that are buried underneath glaciers, sometimes producing impressive subglacial volcanic eruptions. Eyjafjöll is an active subglacial volcano near Katla. The last known eruption at Eyjafjöll was in 1821-23 and it is believed that the volcano is part of a caldera system. Unlike many Icelandic eruptions, the 1821-23 eruption of Eyjafjöll produced intermediate-to-silicic lavas (andesite to rhyolite) tephra rather than basaltic material (like was seen at Laki).

More like this

Eyjafjallajökull, an ice-capped volcano in Iceland that last erupted in 1823. We talked a few weeks ago of signs that there were increasing signs that an eruption could occur on Iceland - increased seismicity on the Reykjanes Ridge suggested that magma might be on the move. Now, we have two pieces…
The steam-and-ash plume from Eyjafjallajokull in Iceland, March 22, 2010. Overnight, the Eyjafjallajokull eruption in Iceland added to its oeuvre, producing what is being reported to be a 8-km plume. Images of the plume (above) suggest (to me) that it is very water-rich, so likely this is the…
MVP 23 revealed ... and 24 introduced! Mystery Volcano Photo #23 was, in fact, Middle Sister volcano in Oregon, part of the picturesque Three Sisters near Bend. Middle Sister is a partially eroded (by glaciers) composite volcano with a mix basaltic andesite to andesite lava flows and tephra…
The GÃgjökull outlet glacier on Eyjafjallajökull, showing the steaming lava flow carving its way through the glacier. Image taken May 5, 2010 by Dr. Joseph Licciardi. A quick update on the ongoing activity at Eyjafjallajökull: The activity at the volcano continues to be more explosive during the…