Indonesia’s Mount Merapi volcano spewed avalanches of hot clouds on Thursday morning as hundreds of residents were evacuated from its fertile slopes.
Lighter eruptions continued during the day, with a column of hot clouds rising 200 metres (656 feet) above the crater.
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The initial eruption of pyroclastic clouds was obscured by fog over the mountain. The amplitude record and seismic recording data from Geological Disaster Technology Research and Development Center estimated the hot clouds spread less than 1km (0.6 miles) from the crater.
Local authorities evacuated more than 500 people living on the mountain in Magelang district on Java Island.
“Until now, the potential danger is not more than 5 km [3 miles],” chief of Yogyakarta’s Volcanology and Geological Hazard Mitigation Center, Hanik Humaida, said in a statement.
The geological authority had raised the alert level of Mount Merapi to the second-highest level in November after sensors picked up increasing activity. Tourism and mining activities were halted.
The 2,968-metre (9,737-foot) mountain is about 30km (19 miles) from the Yogyakarta city centre. About a quarter-million people live within 10km (6 miles) of the volcano, according to authorities in surrounding districts.
It spewed ash and hot gas in a column as high as 6km (4 miles) into the sky in June, but no casualties were reported.
Its last big eruption in 2010 had killed 347 people and caused the evacuation of 20,000 villagers.
Indonesia, an archipelago of more than 250 million people, sits on the Pacific “Ring of Fire” and is prone to earthquakes and volcanic eruptions. Government seismologists monitor more than 120 active volcanoes.