Unexpected: The Calbuco last erupted in 1972, and while it is widely believed to be among Chile's most dangerous, it was not under observation before it erupted in April (the eruption pictured from Puerto Varas)
A view from a domestic flight from Denpasar to Yogyakarta that was subsequently diverted to Surabaya airport shows a plume of gas and ash billowing some 10 km (six miles) high from the Mount Merapi volcano during an eruption
Guatamala, Santa Maria, 12/29/2009. Santa Maria ia a large active volcano in the Western Highlands of Guatemala, close to the city of Quetzaltenango. Last eruption 2013 (continuing): Elevation 12,375 ft. Its eruption in 1902 (VEI 6) was one of the four largest eruptions of the 20th century, after the 1912 Novarupta and 1991 Pinatubo eruptions. It is also one of the five biggest eruptions of the past 200 (and probably 300) years.