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3 clusters · 32 sources · 9 days · First seen · Last updated

Anak Krakatau volcanic activity and new land formation

Overview

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. This decision, effective September 21, 2026, was based on 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 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, 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 accumulations of volcanic debris rather than independent volcanoes. The eruptions caused significant environmental impacts, with ash plumes reaching 15,000 feet and disrupting thousands of flights. Authorities continue to prohibit public access within a two-kilometer radius 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.

Entities

Anak Krakatau · Geological Agency of Indonesia · Sunda Strait · Center for Volcanology and Geological Hazard Mitigation · Geological Agency of the Ministry of Energy and Mineral Resources

Claims

What the coverage asserts, and how many sources carry each claim.

Timeline

  1. 3 days ago

    [INTERNATIONAL] 23 sources
    Anak Krakatau expands land area following September eruptions

    Anak Krakatau's land area has expanded by 32.8 hectares following eruptions in early September 2026, with two new small land masses detected near the volcano in the Sunda Strait.

  2. 5 days ago

    [INTERNATIONAL] 9 sources
    Anak Krakatau volcano activity downgraded to Level II Warning

    Indonesia's Geological Agency has lowered Mount Anak Krakatau's activity level from Alert (Level III) to Warning (Level II) following a decrease in volcanic eruptions and seismic activity.

  3. 12 days ago

    [INTERNATIONAL] 5 sources
    Anak Krakatau transitions to Strombolian eruption phase

    Anak Krakatau has moved into a Strombolian eruption phase. Experts report rapid volcanic growth but note that current conditions pose a low tsunami risk from potential collapses.

Sources

antaranews.com · bantenraya.com · bisniswisata.co.id · clovermedia.jp · cnbcindonesia.com · daerah.sindonews.com · denpasar24.com · en.antaranews.com · fr.news.yahoo.com · harianjogja.com · indonesiamaritimenews.com · industry.co.id · inews.id · langgam.id · lucesdelsiglo.com.mx · mediabanten.com · mediaindonesia.com · mediakampung.com · minanews.net · mykmu.net · noticiasambientales.com.ar · okezone.com · redaksiaceh.com · regional.liputan6.com · riliskalimantan.com · rri.co.id · scitechdaily.com · seputaraceh.id · sumeks.disway.id · tuoitre.vn · utusan.com.my · viva.co.id

This summary has been updated 6 times: see revision history