
Two new islands have appeared off Anak Krakatoa’s northwest and southeast coasts, potentially the first to emerge in the caldera since the 1883 Krakatoa eruption, according to preliminary agency analysis linking their formation to fluid magma reaching the surface through a fissure.
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Anak Krakatoa is a volcanic island that emerged from the caldera formed by the catastrophic 1883 eruption of Krakatoa, one of the most violent volcanic events in recorded history.
Two new islands have appeared off Anak Krakatoa, potentially the first in nearly a century to emerge within the caldera left by Krakatoa’s catastrophic 1883 eruption.
The agency places one about 760 metres (0.5 miles) off Anak Krakatoa’s northwest coast and the other some 495 metres to the southeast. It has not verified their dimensions or elevation above sea level.
The agency’s preliminary interpretation is that relatively fluid magma released during the continuous eruption reached the surface via an elongated northwest-southeast opening, with erupted material forming two island-like mounds offshore.

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