Eruptions are a regular occurrence at Anak Krakatau, a small volcano between the Indonesian islands of Java and Sumatra. Much of its activity remains relatively mild, but it occasionally puts on more impressive and hazardous shows of force. In early September 2026, a booming eruption lasting more than 24 hours sent gas and ash high into the atmosphere, disrupting thousands of flights and degrading air quality in parts of the country, including the capital city of Jakarta.
Satellites passing over the area during the eruption on September 5 captured images of the explosive activity. In the scene above, acquired with the OLI (Operational Land Imager) on the NASA-USGS Landsat 8 satellite, a white plume of volcanic gas billows over a brown ash cloud. Below, a wider view captured by the VIIRS (Visible Infrared Imaging Radiometer Suite) on the Suomi NPP satellite shows the volcanic material dispersing over a large area.
Indonesia’s meteorological agency reported that ash had reached altitudes up to 6,000 meters (20,000 feet) to the east of the volcano and 15,000 meters (50,000 feet) to the west by September 6. The presence of ash in the atmosphere prompted the temporary closure of eight airports on Java and Sumatra, disrupting nearly 3,000 flights in and out of the area, according to news reports.
Plumes of ash and volcanic gases from Anak Krakatau drift over Indonesia and the Indian Ocean in this image captured by the VIIRS (Visible Infrared Imaging Radiometer Suite) on the Suomi NPP satellite on September 5, 2026. NASA Earth Observatory/Michala GarrisonAshfall affected populated areas, particularly to the east of Anak Krakatau in Jakarta and other parts of West Java, the Indonesian Humanitarian Coordination Platform (IHCP) reported. Volcanic ash poses health risks to people and can irritate the respiratory tract, eyes, and skin. However, this air quality hazard differs from the smoke produced by peatland fires elsewhere in the country in terms of particle characteristics, dispersal patterns, and protection measures, the IHCP noted.
On September 6, the continuous explosive eruption from Anak Krakatau subsided, though the volcano kept rumbling. It returned to a more typical pattern of Strombolian eruptions, characterized by intermittent spurts of ash and volcanic material. Airports had resumed operation by September 8, but the volcano remained at the second-highest alert level on the country’s scale, as it has been since early July.
NASA Earth Observatory images by Michala Garrison, using Landsat data from the U.S. Geological Survey, and VIIRS data from NASA EOSDIS LANCE, GIBS/Worldview, and the Suomi National Polar-orbiting Partnership. Story by Lindsey Doermann.
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September 5, 2026: Landsat
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September 5, 2026: VIIRS
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References & Resources
ABC News (2026, September 7) Flights to and from Indonesia’s capital resume after volcanic eruption forced a 2-day closure. Accessed September 8, 2026. BBC (2026, September 8) Indonesia airports reopen after volcano eruption leaves 340,000 stranded. Accessed September 8, 2026. BMKG (2026, September 7) Imbas Sebaran Abu Vulknaik Anak Krakatau, 8 Bandara Ditutup Sementara, BMKG Minta Waspada dan Tenang. Accessed September 8, 2026. BMKG (2026, September 6) BMKG Terus Pantau Dampak Erupsi Gunung Anak Krakatau. Accessed September 8, 2026. Global Volcanism Program (2026) Krakatau. Accessed September 8, 2026. Indonesia Humanitarian Coordination Platform (2026, September 6) Anak Krakatau Eruption, Volcanic Ashfall and Concurrent Forest Fire & Haze Situation. Accessed September 8, 2026. NASA Earth Observatory, Anak Krakatau. Accessed September 8, 2026.You may also be interested in:
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