Indonesia has raised the alert level for Mount Bur Ni Telong in Aceh to the second highest after a rise in volcanic earthquakes and other signs of increased activity. The 2,624-metre stratovolcano in Bener Meriah regency is being closely monitored as authorities warn of possible eruptions, including phreatic blasts and hazardous gas emissions.
Rising Seismic Activity
The volcano recorded multiple earthquakes in a single day, including shallow volcanic quakes, deep quakes and tectonic tremors. Some of these were felt several kilometres away. Monitoring data showed that activity has increased since July and became more intense and shallow over the past two months.
Alert Level and Safety Measures
Scientists raised the alert from the third to the second highest level after visual and instrumental observations confirmed heightened volcanic unrest. Residents and visitors have been advised to stay at least 4 kilometres from the crater. Authorities have also warned people to avoid fumarole and solfatara zones, especially during cloudy or rainy weather, when gas concentrations can become dangerous.
Risk of Eruption and Gas Emissions
Although no crater smoke was visible, officials said the volcano could still produce sudden phreatic eruptions. These are steam-driven explosions that can occur without warning. The presence of fumaroles and solfataras increases the risk of toxic gas exposure near the summit area.
Disaster Context in Aceh
The alert comes as Bener Meriah is still recovering from severe floods and landslides that struck Sumatra earlier this month. The disaster caused heavy loss of life, displacement and damage to remote villages. Evacuations are under way in villages close to the crater, as heavy rain and volcanic unrest may complicate relief and safety operations.
Last Modified: April 25, 2026