The Weekly Volcanic Activity Report: September 3-9, 2026
New activity/unrest was reported for 4 volcanoes from September 3 to 9, 2026. During the same period, ongoing activity was reported for 20 volcanoes.
New activity/unrest was reported for 4 volcanoes from September 3 to 9, 2026. During the same period, ongoing activity was reported for 20 volcanoes.
Indonesian search teams recovered an unidentified life jacket west of Anyer on September 10, 2026, during the third day of operations for eight people — five journalists, a boat captain, a crew member and a guide — missing in the Sunda Strait after travelling toward Anak Krakatau to cover its eruptive activity. The Indonesian National Search and Rescue Agency (Basarnas) said the operation had expanded to six search sectors, with at least 11 principal vessels, more than 300 personnel and a Dauphin AS365 N3+ helicopter deployed. Authorities said the life jacket had not been linked to the missing speedboat, while an aerial search found no sign of the group.
Volcanic ash from Anak Krakatau prompted temporary closures at eight airports across western Indonesia on September 6, 2026. As of 17:06 WIB (10:06 UTC), the Ministry of Transportation reported 1 558 delayed flights and approximately 170 000 affected passengers, while the closures were extended through 24:00 WIB (17:00 UTC). The volcano remained at Level III (Siaga), with a 3 km (2 miles) exclusion zone around its center of activity.
A high-level eruption at Anak Krakatau, Indonesia, ejected volcanic ash up to 15 km (50 000 feet) above sea level at 00:50 WIB on September 5, 2026 (17:50 UTC on September 4). Darwin Volcanic Ash Advisory Center (VAAC) later tracked the ash moving west at approximately 74 km/h (46 mph), while a second layer to about 5.5 km (18 000 feet) extended south. SIGMETs were issued for the Jakarta and Melbourne flight information regions.
Indonesia’s Geological Agency raised Anak Krakatau alert from Level II (Waspada) to Level III (Siaga) at 16:30 WIB (09:30 UTC) on July 2, 2026, after an eruption at 14:05 WIB (07:05 UTC) sent a dense gray-to-black ash plume about 200 m (656 feet) above the summit. The agency set a 3 km (1.9 miles) exclusion zone around the active crater.
The Anak Krakatau volcano, located in Indonesia’s Sunda Strait, has resumed its explosive activity, exhibiting a series of short-lived lava-fountaining episodes known as paroxysms last night. The eruptions lasted up to 150 seconds while ash was reaching 2 100 m (7 000 feet) above sea level.
The Anak Krakatau volcano in Indonesia entered a period of intense eruptive activity around 05:28 UTC on November 26, 2023. The volcano has since produced numerous explosions, with ash columns reaching heights of up to 2.1 km (7 000 feet) above sea level. Officials are urging residents to stay away at least 5 km (3.1 miles) from the volcano.
Seismic activity at Mount Anak Krakatau intensified on October 28, 2023, prompting Indonesian authorities to issue a 5 km (3.1 miles) exclusion zone around the main crater. The heightened activity included a range of earthquakes and internal vibrations indicative of potential eruptions.
After weeks of phreatic activity, Vulcanian type of explosions started at the Anak Krakatau volcano in Indonesia on July 20, 2023.
Anak Krakatau, the infamous volcano situated between the islands of Java and Sumatra, has experienced a series of significant eruptions since June 6, 2023. The Indonesian volcano, known as the “Child of Krakatau,” is located in the crater formed by the devastating eruption of Mount Krakatau in 1883, one of the deadliest and most destructive in recorded history.