Anak Krakatau Eruption Declared Over

Jakarta: The eruption of Mount Anak Krakatau has been declared over after lasting for 25 hours. This announcement was made by the Geological Agency of the Ministry of Energy and Mineral Resources (ESDM).

"After the continuous eruption episode ended, three Strombolian eruptions with black eruption columns were observed. The return of Strombolian eruptions, a characteristic feature of Mount Anak Krakatau, is tentatively interpreted as the conclusion of that prolonged continuous eruption episode," said Head of the Geological Agency Lana Saria, as quoted by Antara on Monday, September 7, 2026.

Although declared over, volcanic activity continues to be monitored due to persistently high seismicity levels. Lana explained that the continuous eruption episode of Mount Anak Krakatau lasted from Friday, September 4, 2026, at 23:07 WIB (Western Indonesian Time) until Sunday, September 6, 2026, at 00:04 WIB.

Following that period, eruptive activity reverted to the mild eruption pattern characteristic of Mount Anak Krakatau, located in Lampung Province.

Lana stated that while the continuous eruption episode has concluded, instrumental monitoring results from September 6–7, 2026, still indicate high seismic activity.

Observations recorded three eruption earthquakes, nine emission earthquakes, 93 low-frequency earthquakes, 98 hybrid/multi-phase earthquakes, four continuous tremor episodes, and one shallow volcanic earthquake.

These conditions mean Mount Anak Krakatau's activity level remains at Level III (Alert/Siaga). The Geological Agency assesses that the potential for eruptions in the coming period remains quite high.

"The primary hazards include the ejection of incandescent rocks and heavy ashfall, as well as the potential for lava flows should continuous eruptions resume," she explained.

The Geological Agency of the Ministry of ESDM also urges the public, tourists, and hikers to refrain from any activities within a 3-kilometer radius of Mount Anak Krakatau's active center. Additionally, residents affected by volcanic ash are advised to limit outdoor activities or wear masks to prevent respiratory issues.

"Residents in the coastal areas of Banten and Lampung should remain calm and disregard rumors linking the eruption to a potential tsunami. Citizens are asked to go about their normal activities while continuing to follow the directives of the local Regional Disaster Management Agency (BPBD)," said Lana.

The Geological Agency, through the Center for Volcanology and Geological Hazard Mitigation (PVMBG), continues to monitor the activity of Mount Anak Krakatau.

Monitoring is conducted via two observation posts: the Pasauran Observation Post in Cinangka District, Serang Regency, Banten Province; and the Kalianda Observation Post in Hargo Pancuran Village, Rajabasa District, South Lampung Regency, Lampung Province.

Through continuous monitoring and public adherence to safety recommendations, it is hoped that developments in Mount Anak Krakatau's activity can be managed effectively using mitigation measures based on volcanic observation and data.