Is Mount Anak Krakatau Still Erupting? Here Is Its Latest Activity
Mount Anak Krakatau continued to erupt as of Monday (7 September 2026). According to the latest evaluation by the Geological Agency, the eruptive activity currently being monitored takes the form of Strombolian eruptions.
The continuous eruption that lasted approximately 25 hours ended on 6 September 2026. Following the end of that continuous eruption episode, Mount Anak Krakatau returned to Strombolian eruptions.
Strombolian Eruptions Continue
Referring to the evaluation of Mount Anak Krakatau’s activity issued by the Geological Agency at 06.00 WIB on 7 September 2026, visual observations during the 6–7 September period showed Strombolian eruptions.
“Visual observations and CCTV footage show Strombolian eruptions occurring, with the eruption column black in colour and the height of the eruption column not observed,” the Geological Agency wrote in its report.
Thus, the eruptive activity of Mount Anak Krakatau is still ongoing. However, the character of the eruption has now returned to Strombolian, after a continuous eruption episode previously took place.
Continuous Eruption Ends After 25 Hours
The Geological Agency recorded that Mount Anak Krakatau experienced a continuous eruption from 4 September 2026 at 23.07 WIB. That episode ended on 6 September 2026 at 00.04 WIB, after lasting 25 hours.
After the continuous eruption ended, three Strombolian eruptions were recorded. The Geological Agency said the return of the Strombolian character is, for the time being, interpreted as the end of the fairly long continuous eruption episode.
“Three Strombolian eruptions occurred after the continuous eruption episode ended,” the Geological Agency wrote.
Although the continuous eruption has ended, the development of Mount Anak Krakatau’s volcanic activity continues to be monitored and evaluated. The Geological Agency also stated that the probability of further eruptions in the coming periods remains high.
Volcanic Activity Still Being Monitored
During the 6–7 September 2026 period, instrumental observations recorded three eruption earthquakes, nine blowing earthquakes, 93 Low Frequency earthquakes, and 98 Hybrid/Multi-Phase earthquakes.
In addition, four Continuous Tremor earthquakes and one Shallow Volcanic earthquake were recorded. The energy of volcanic activity, as reflected in the RSAM value, rose on 5 September 2026 before decreasing again on 6 September 2026.
The Geological Agency assesses that the current eruption hazards stem from the ejection of incandescent rock accompanied by heavy ash rain. Should a continuous eruption recur, there is potential for lava flows.
Mount Anak Krakatau Remains at Level III
As of the 7 September 2026 evaluation, Mount Anak Krakatau’s activity level remains at Level III, or Siaga (Alert). Residents, visitors, tourists, and climbers are not permitted to enter the area within a 3-kilometre radius of the centre of activity.
“Anak Krakatau at Level III (Siaga) remains in effect until the next evaluation letter/report is issued,” the Geological Agency stated.
The Geological Agency also urged communities affected by volcanic ash to reduce outdoor activities or wear masks when active outside, in order to avoid respiratory problems.
Meanwhile, communities in coastal areas of Banten and Lampung have been asked to remain calm and not to believe rumours that Mount Anak Krakatau’s activity will cause a tsunami. People are urged to follow the directions of their local BPBD and to monitor official information from the Geological Agency and PVMBG.
In conclusion, the continuous eruption of Mount Anak Krakatau has ended, but eruptive activity is still occurring in the form of Strombolian eruptions.