Qualla: Anak Krakatoa

Anak Krakatoa: Introduction

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit Uprising, CC BY-SA 3.0. The island that grows in the grave of its parent first broke the surface on 29 December 1927, a smudge of volcanic rock pushing up from the submerged caldera where Krakatoa had torn itself apart 44 years earlier. Waves destroyed it within a week. It came back. Waves destroyed it again. It came back again. This cycle repeated for three years before the island finally established a permanent foothold above sea level on 11 August 1930, earning the name Anak Krakatau -- "Child of Krakatoa." The name carries a certain dark humor. Like its parent, Anak Krakatau has proven spectacularly destructive, collapsing into the sea in December 2018 and triggering a tsunami that killed 437 people. And like its parent, it is already rebuilding.

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Image: Uprising | CC BY-SA 3.0

Anak Krakatoa: Inheriting the Caldera

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit Lord Mountbatten, CC BY-SA 3.0. The 1883 eruption of Krakatoa was one of the most violent volcanic events in recorded history. It obliterated roughly two-thirds of the island's mass, collapsing the peaks of Perboewatan and Danan and leaving only the southern half -- the Rakata volcano -- as a remnant above wate...

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Image: Lord Mountbatten | CC BY-SA 3.0

Anak Krakatoa: A Collapse Foretold

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit Tyke, CC BY-SA 4.0. Scientists knew what was coming. In January 2012, volcanologists at the University of Oregon published a warning that a tsunami caused by flank collapse of Anak Krakatau was likely. The volcano had been building itself on the steep eastern slope of the 1883 caldera, an inherently...

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Image: Tyke | CC BY-SA 4.0

Anak Krakatoa: Two-Thirds Gone Overnight

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit Lord Mountbatten, CC BY-SA 3.0. Satellite data and helicopter footage confirmed the scale of the destruction within a day. The volcano had lost over two-thirds of its volume. Its elevation above sea level had plummeted dramatically. The main volcanic conduit was now erupting from underwater, producing Surtseyan...

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Image: Lord Mountbatten | CC BY-SA 3.0

Anak Krakatoa: The Volcano That Will Not Rest

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit Dwi Bayu Radius, CC BY-SA 4.0. On the morning of 10 April 2020, residents of Jakarta -- 150 kilometers away -- heard a deep rumble. Anak Krakatau was erupting again. The initial burst lasted just one minute and twelve seconds, but it threw an ash column 200 meters into the air, with secondary plumes reaching 1...

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Image: Dwi Bayu Radius | CC BY-SA 4.0

Anak Krakatoa: A Laboratory in the Strait

Thu, 26 Mar 2026 00:00:00 GMT

Photo credit Raul Heinrich, CC BY-SA 3.0. For volcanologists, Anak Krakatau is an extraordinary natural laboratory -- a young, active volcano whose entire life history has been observed and documented. From its first tentative emergence in 1927 through its catastrophic 2018 collapse and ongoing reconstruction, every phas...

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Image: Raul Heinrich | CC BY-SA 3.0