Ejected incandescent material poses major danger during Anak Krakatau eruption

Incandescent material thrown from Anak Krakatau has become one of the main dangers surrounding the volcano’s eruption, Indonesia’s Geological Agency warned.

The material can damage equipment near the center of activity and endanger anyone entering the restricted zone, said Lana Saria, head of the Geological Agency at the Ministry of Energy and Mineral Resources. She also listed volcanic rocks, ash, highly concentrated volcanic gases and possible eruption-material flows around the crater and the body of Anak Krakatau as hazards.

“Ejected material can damage equipment located near the center of activity and endanger anyone who enters the restricted zone,” Lana said at a news conference on the eruption’s development on Sept. 6.

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Ejected material can damage equipment located near the center of activity and endanger anyone who enters the restricted zone.

She said Anak Krakatau’s activity could still fluctuate and intensify. Low-frequency, hybrid and harmonic earthquakes, along with tremors, continue to be recorded. “These types of earthquakes indicate the movement or release of volcanic fluids within the volcanic system,” Lana said.

Activity began increasing in July 2026. On July 2, authorities raised the volcano’s status from Level II, or Alert, to Level III, or Standby. The highest activity occurred on Sept. 5. A continuous eruption began at 11 p.m. local time on Sept. 4, accompanied by lava fountains, rumbling sounds and explosions.

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These types of earthquakes indicate the movement or release of volcanic fluids within the volcanic system.