[Geology2] The 26 October 2013 paroxysm of Etna's New Southeast Crater

http://www.youtube.com/watch?v=5zMSLpRjsQI

Paroxysms.

There is a distinction between a paroxysm and an paroxysmal eruptive episode. In the case of the Etna you have a certain pattern that becomes eminent. This pattern is the paroxysmal eruptive episode. It first starts with the build-up. Small (Strombolian) explosions and an increase in volcanic and seismic activity mark this phase. Experts call this phase the prelude and waxing. It can span from less than an hour to a couple days. The transition to phase 2 is marked by almost continuous Strombolian activity. Phase two marks the paroxysmal episode and is called the climax. This is marked by ash columns and often accompanied by lava fountains up to hundreds of meters high. Usually lava flows are generated during this phase. The transition to phase three is marked by a rapid decrease in activity. This last phase in a paroxysmal eruptive episode is called the diminution and cessation. The effusion of lava will cease completely and some Strombolian explosions will still take place.

http://www.dramsch.net/archives/114-Mama-Etna-is-back!.html

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