The Semeru volcano, on the island of Java in Indonesia, was placed on Sunday December 4 on high alert by the authorities following an eruption, a year after a deadly disaster.
The Center for Volcanology and Prevention of Geological Disasters (PVMBG) has raised Mount Semeru's alert level from level three to level four, its spokesperson Hendra Gunawan told Kompas TV.
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This means that danger threatens populated areas and the activity of the volcano has intensified
," he added.
Located in the east of the island of Java, of which it is the highest point with an altitude of 3,676 meters, Mount Semeru spat an ash cloud about 1.5 km high on Sunday.
Stay at least 8 km away from the crater
No casualties were reported immediately after the eruption, but Hendra Gunawan advised nearby residents to stay at least 8 km away from the crater.
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The volcano's last eruption, exactly a year ago, killed at least 51 people.
Mudslides and ash engulfed entire villages and nearly 10,000 people had to flee their homes.
Indonesia sits on the Pacific Ring of Fire, where the meeting of continental plates causes strong volcanic and seismic activity.
The Southeast Asian archipelago has nearly 130 active volcanoes.