Semeru - also known as "The Great Mountain" - is the highest volcano in Java and one of the most active. It is also one of Indonesia's most popular tourist hiking destinations.
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The volcano previously erupted in December, when about 550 people were evacuated.
Within the last week, Indonesia has endured multiple landslides, a deadly earthquake on Sulawesi island, and the loss of a Sriwijaya Air Boeing 737 with 62 people on board.
Indonesia sits on the Pacific "Ring of Fire" where tectonic plates collide, causing frequent volcanic activity as well as earthquakes.