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Anak Krakatau volcanic activity and new land formation

Updated 6 times since CLSTR started tracking revisions of this situation.

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2026-09-26 01:53 UTC → 2026-09-26 04:53 UTC · added removed

The Anak Krakatau volcano in the Sunda Strait has undergone a shift in activity levels. In mid-September 2026, the volcano transitioned from a period of continuous eruption to a Strombolian phase, marked by more episodic activity. During this time, experts noted rapid constructive growth driven by a mature magma system, though officials indicated that the volcano’s current height and slope made tsunami-triggering collapses unlikely. By late September 2026, the Geological Agency downgraded the alert level from Level III (Alert) to Level II (Warning) following a downward trend in volcanic activity. The This decision, effective September 21, 2026, was based on a comprehensive evaluation of declining activity and deformation data showing deflation. Following the eruptions in early September, satellite imagery from the Geological Agency of Indonesia and Sentinel revealed the emergence of new land formations in the northwest, west, and southwest sectors. This expansion, totaling approximately 32.8 hectares, resulted from the deposition of lava flows and pyroclastic material in the shallow waters of the ancient caldera during a 25-hour period of continuous eruption between September 4 and September 6, 2026. This growth has brought the volcano’s total land area to 341.5 hectares, a size that exceeds exceeding its dimensions prior to the 2018 collapse. Researchers have also detected two small mounds or islets to the northwest and southeast of the main volcano. Experts clarify that these are not independent volcanoes with their own magma systems, but rather accumulations of volcanic debris. debris rather than independent volcanoes. The eruptions also caused significant environmental and logistical impacts, with ash plumes reaching altitudes of 15,000 feet, feet and disrupting thousands of flights and affecting air quality. flights. Authorities continue to prohibit the public, tourists, and hikers from entering public access within a two-kilometer radius around of the crater and advise maintaining a distance of at least 1 km from the newly detected mounds. Field surveys are scheduled for October 2026 to further investigate these new land masses.

Versions

  1. 2026-09-26 04:53 UTC Anak Krakatau volcanic activity and new land formation
  2. 2026-09-26 01:53 UTC Anak Krakatau volcanic activity and new land formation
  3. 2026-09-25 18:48 UTC Anak Krakatau volcanic activity and new land formation
  4. 2026-09-25 02:01 UTC Anak Krakatau volcanic activity and new land formation
  5. 2026-09-24 07:03 UTC Anak Krakatau volcanic activity and new land formation
  6. 2026-09-23 23:43 UTC Anak Krakatau volcanic activity
  7. 2026-09-22 03:01 UTC Anak Krakatau volcanic activity

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