7 Kilauea, Hawai'i (28)
Kilauea is one of the perennial Pliny contenders - landing one spot higher in the 2012 countdown than in 2011, when it actually produced a new fissure eruption (just shows that 2012 was a volcanically-subdued year). We saw rising/falling of the lava lakes, new ocean entries and plenty of lava flows along the east rift zone of the shield volcano -- all events that should continues into 2013 (although I'm hoping for something big in March when I'll be visiting Kilauea for the first time!)
Image: A pahoehoe lava flow on the coastal plain of Kilauea, seen on October 29, 2012. HVO/USGS.
