Indonesia’s Anak Krakatau erupts overnight

Indonesia’s Mount Anak Krakatau erupted repeatedly overnight into Saturday, sending volcanic rocks and ash into the air, the country’s Geological Agency said.

“As of today, September 5, 2026, at 4:40 a.m. Western Indonesian Time, the eruption is still ongoing, and rumbling can still be heard from the Krakatau Pasauran PGA Post,” the agency said in a statement, Tempo reports.

The volcano has remained active since July 2, when its alert status was raised to Level III, according to Indonesian media outlet Tempo.

The height of the eruption column could not be observed, but the agency said the plume was clearly visible because of its bright red colour.

According to eruption data from the MAGMA Indonesia monitoring system, seismic activity associated with the eruption was first recorded on Friday, September 4, at 4:11 a.m. local time. The seismograph registered a maximum amplitude of 33 millimetres and a duration of 14 seconds.

Further eruptions were recorded at 4:19 a.m., 4:28 a.m. and 5:46 a.m., with greater amplitudes and slightly longer durations.

After a period of relative calm, another series of eruptions began at around 10:03 p.m. on September 4. Available monitoring data recorded six eruptions between 10:03 p.m. and 12:01 a.m. September 5.

Anak Krakatau is the volcanic island that emerged in the Sunda Strait following the collapse of the original Krakatau volcano in 1883.

By Sabina Mammadli