VIDEO: Anak Krakatau's 25-hour eruption period has ended
The volcano remains at Alert status, with a three-kilometer exclusion zone and mask advice for coastal residents exposed to ash.
Monday, 7 September 2026 08:44
Indonesia’s Geological Agency said Mount Anak Krakatau’s 25-hour continuous eruption episode in the Sunda Strait ended early Sunday, ANTARA reported on September 7.
The eruption episode began on September 4, at 11:07 p.m. local time and officially ended on September 6, at 12:04 a.m. Geological Agency head Lana Saria gave the timing in an evaluation report received in Jakarta on Monday.
"Following the end of that episode, Mount Anak Krakatau's volcanic activity transitioned back to Strombolian eruption characteristics, marked by the recording of three Strombolian eruption earthquakes," Saria said. The agency interpreted that shift as a sign that the long, continuous eruption phase had ended.
The agency said the probability of further eruptions in the following period remains high. Instrumental observations on September 6–7 recorded three eruption earthquakes, nine emission earthquakes, 93 low-frequency earthquakes, 98 hybrid or multi-phase earthquakes, four continuous tremor earthquakes and one shallow volcanic earthquake.
The Real-time Seismic Amplitude Measurement graph spiked on September 5, but has declined since Sunday. Tiltmeter data at Tanjung Station showed indications of slight inflation since early August 2026, while Lava93 Station showed a constant pattern.
The Geological Agency kept Mount Anak Krakatau at Level III, or Alert status. It advised the public, tourists and climbers to stay outside a three-kilometer danger radius from the active crater, and told coastal residents in Banten and Lampung provinces to remain calm, ignore hoaxes about potential tsunamis and wear masks outdoors to limit exposure to volcanic ash.
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