Recently, Mount Sinabung on the Indonesian island of Sumatra blasted volcanic ash as high as 4.2 kilometers (2.6 miles).
Hot ash tumbled down the mountain’s slopes as far as 4.5 kilometers (2.8 miles) east and southeast into the Labortus River.
Mount Sinabung also known as Dolok Sinabung, Deleng Sinabung, Dolok Sinaboen, Dolok Sinaboeng and Sinabuna is a Pleistocene-to-Holocene stratovolcano of andesite and dacite in the Karo plateau of Karo Regency, North Sumatra, Indonesia, 25 miles from the Lake Toba supervolcano.
The 2,460-meter (8,070-foot) high Sinabung burst back to life in 2010 after a long period of dormancy.
The volcano has been erupting sporadically ever since, killing 17 people and forcing more than 30,000 to evacuate their villages.
