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Aug. 30, 2010 -- Over the weekend, Indonesia's Mount Sinabung awoke on Sumatra with a series of explosions that hurled ash over a mile into the air and sent it raining down on local communities up to 20 miles away. Authorities have established a six-kilometer (3.7-mile) zone of exclusion around the volcano and evacuated 30,000 people.
On Monday, a six-hour-long eruption produced an unusual sight: two plumes of ash spewing out of the top of the volcano (bottom). Little is known about the volcano's history, which is last thought to have erupted 400 years ago, but the forked ash clouds are likely due to a blockage in the volcano's main vent.
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