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Mt. Anak Krakatau, a volcano in Indonesia's Sunda Strait between the islands of Java and Sumatra, erupted overnight into Saturday, spewing rocks and volcanic 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.
The volcano's eruptions have continued since July 2, when its alert status was raised to Level III, local media outlet Tempo reported.
"The height of the eruption column was not observed, but the bright red color of the eruption plume was clearly visible," the report said.
MAGMA Indonesia, a digital platform that provides real-time information on geological hazards across the country, said seismic activity linked to the eruption began Friday morning, with the seismograph registering a maximum amplitude of 33 millimeters and a duration of 14 seconds.
Three more eruptions occurred Friday morning, followed by a lull before another series late Friday. Six eruptions were recorded through 12:01 a.m. local time Saturday (5:01 p.m. GMT Friday).
The Geological Agency said the eruption resembled a "lava fountain" that produces lava flows, adding that continuous eruptions lasting several hours are common.
The agency said it received reports of booming sounds and vibrations in parts of West Java, Banten and Lampung provinces that occurred at the same time as Anak Krakatau's activity and are suspected to be related.
It said the volcano's growth since its Dec. 22, 2018 eruption remains relatively small, adding that there is no potential for a collapse large enough to trigger a tsunami.
Indonesia lies along the Pacific "Ring of Fire," a seismically active zone of fault lines and volcanoes where earthquakes are frequent.
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