Geology Chief Links Javan Tremors to Anak Krakatau Eruption

Anak Krakatau’s continuing eruption produced a red glow and activity resembling a lava fountain, Indonesia’s Geological Agency said, as residents in West Java, Banten and Lampung reported booms and tremors.

Geological Agency chief Lana Saria said the eruption produced a continuous red-hot glow, although the height of the eruption column could not be observed. The activity generated lava flows and continued for several hours, a pattern she described as common in lava-fountain eruptions.

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The height of the eruption column could not be observed, but the bright red color of the eruption plume was clearly visible continuously. This eruption phenomenon resembles a lava fountain that produces lava flows.

The eruption has remained Strombolian, producing incandescent rock fragments and volcanic ash. Saria said the booms and vibrations reported across the three provinces were suspected to be connected to Anak Krakatau’s activity because they occurred at the same time.

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The booms and tremors reported by residents in several areas of West Java, Banten and Lampung are suspected to be related to the activity of Anak Krakatau, which occurred at the same time.

The volcano has held Alert Level III since July 2, 2026. Saria said the part of the volcano that regrew after the Dec. 22, 2018 eruption remained relatively small and was not likely to collapse on a scale capable of triggering a tsunami. Authorities were continuing to monitor changes in its activity and morphology.

The current danger instead comes from lava flows, potentially accompanied by incandescent rocks. Saria urged people to stay outside a three-kilometer radius around the volcano’s activity center.

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The regrown body of Anak Krakatau formed after the Dec. 22, 2018 eruption remains relatively small and does not have the potential to collapse on a scale that could trigger a tsunami.