this is merely a collection of pictures, songs, articles, videos, and objects that i find interesting. all known sources are provided (i think). feel free to contribute with a citation or author/ artist if known. these are all things i just don't want to forget.
Sunday, March 21, 2010
The big news this morning is the eruption that started last night at Eyjafjallajokull in Iceland, producing a 1-km fissure vent. The pictures and videos I've seen so far have been quite impressive, with the classic look of a "curtain of fire", where basaltic lava erupts explosively from a linear array of vents - you can see the geometry in the image from the BBC/AP (above). Especially clear is the dual nature of the eruption, with both the explosive fire fountains and the effusive (passive) lava flows from the root of the curtain of fire. In many "curtain of fire" eruptions on Hawai`i, the curtain (see below) eventually coalesces into a single fire fountain, sometimes producing fountains that can reach a few kilometers in height. This will be something to watch for in the coming days if the eruption continues.
Airspace over Iceland is closed for the moment, although these style of eruptions don't produce much of volcanic ash - although there is likely significant fine droplets of lava forming some ash fragments, Pele's tears and Pele's hair (all basaltic volcanic products). However, eruptions like this can emit a lot of volcanic gases like carbon dioxide and sulfur dioxide - much like this eruptions distant relative, the Laki eruption of 1783. And even though the eruption is explosive, the hazard to surrounding communities is relatively low unless the lava flows encroach on populated areas or there is significant ice/snow melt to produce lahars or a jokulhlaup. However, Icelandic authorities have evacuated hundreds of people from the region near the eruption as a precaution (with text messages no less!)