Anak Krakatau eruption creates new land in Indonesia as lava expands island by about 33 hectares
Indonesia’s geological authorities have revealed new changes to the landscape surrounding Anak Krakatau volcano, after a series of eruptions and lava flows expanded the volcanic island and led to the emergence of new land formations in the area between the islands of Java and Sumatra.
According to a Reuters report published on October 3, 2026, citing the Indonesian Geological Agency, volcanic lava flows added approximately 32.8 hectares—nearly 81 acres—to Anak Krakatau’s land area. Satellite images also showed the formation of two new land masses near the volcano, providing a clear indication of the speed at which volcanic activity can reshape coastlines and islands.
An island changing with every wave of activity
Anak Krakatau, whose name means “Child of Krakatau,” emerged from the volcanic activity that followed Krakatau’s historic eruption in the 19th century. Since appearing above sea level, the volcano has remained one of the region’s most geologically active sites, with its terrain constantly changing as a result of accumulating volcanic material, landslides and marine erosion.
The new developments come as reports from the Smithsonian Institution’s Global Volcanism Program indicate that volcanic activity has continued in recent months. The program cited Indonesia’s Center for Volcanology and Geological Hazard Mitigation as reporting ash and gas plumes, as well as repeated eruptive activity, during the summer of 2026, while safety restrictions around the active crater remained in place.
Satellites detect the birth of new terrain
Satellite imagery is helping scientists compare the island’s shape over short intervals, making it possible to track the new expansion of the lava and the formations that emerged around it. The data provide an important means of monitoring changes that may be difficult to measure in the field because of the danger of approaching the volcano during periods of activity.
The increase in the island’s area does not mean that the risks have receded; environments surrounding active volcanoes remain highly dynamic, and newly formed land may be eroded, collapse or be reshaped by subsequent eruptions. Authorities therefore continue to monitor seismic activity, emissions and surface changes to assess the level of risk.
This geological transformation is part of a series of rapidly accelerating environmental phenomena around the world; read Break’s earlier report on the decline of Greece’s Lake Koroneia under the pressure of drought and heat.
Krakatau: a living natural laboratory
Anak Krakatau is a rare example of an island whose construction and transformation can be observed over a relatively short period. Recent developments show how lava, once it cools and accumulates, creates new land even as the island remains exposed to the forces of the sea and volcanic activity itself.
Sources: Reuters, October 3, 2026; the Smithsonian Institution’s Global Volcanism Program, based on information from Indonesia’s Center for Volcanology and Geological Hazard Mitigation (PVMBG).
Photo: A genuine archive image of Anak Krakatau volcano, not from the October 2026 eruption.
