Mount Anak Krakatau Returns to Alert Level II
A ban on approaching the center of activity at Mount Anak Krakatau remains in effect. The danger radius is set at two kilometers.
Mount Anak Krakatau, the volcanic mountain in the Sunda Strait, has had its alert level reduced to Level II, starting from September 21, 2026, at 18:30 WIB. The mountain was previously raised to Level III (Standby) on July 2, 2026, and has been erupting since then, spewing ash across West Java and West Sumatra. As of September 3, 2026, there were 224 eruptions recorded during the Standby status.
From September 4, 2026, at 23:07 WIB to September 6, 2026, at 00:04 WIB, there were continuous eruptions for 25 hours. Satellite imagery showed lava flows moving northwest, west, and southwest from the eruption center, and volcanic ash reached Greater Jakarta, leading to the closure of several airports, including Soekarno-Hatta International Airport, for safety reasons.
Despite the continuous eruptions, the activity of Mount Anak Krakatau has been decreasing. The mountain emitted seven strombolian eruptions until September 20, 2026, and seismic records showed only one low-frequency earthquake on that day. The continuous tremor amplitude also averaged only 2 mm. However, the safe radius around the volcano has been decreased from two kilometers to one kilometer, which is a one-kilometer reduction from the standby status.
The community around Mount Anak Krakatau, as well as visitors and tourists, are still not permitted to enter or carry out activities within the volcano's area. The level of volcanic activity at Mount Anak Krakatau will be periodically re-evaluated, and if there are significant changes in activity, it may be reassessed.
Written by urgent.news from Tempo.co English's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
