Report on Krakatau (Indonesia) — 19 October-25 October 2022
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 19 October-25 October 2022
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2022. Report on Krakatau (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 19 October-25 October 2022. Smithsonian Institution and US Geological Survey.
6.1009°S, 105.4233°E; summit elev. 285 m
All times are local (unless otherwise noted)
PVMBG reported that multiple ash plumes were visible rising from Anak Krakatau during 24-25 October. Webcam views showed that at 1757 on 24 October a dense black ash plume rose about 150 m above the summit, and at 2111 a dense gray-to-black ash plume rose 150 m and drifted E. Dense gray-to-black ash plumes were visible on 25 October at 0727, 0956, and 1711 rising 150-200 m above the summit and drifting NE. An eruptive event was recorded at 1845 by the seismic network; a webcam photo showed incandescent material being ejected above the crater rim. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay at least 5 km away from the crater.
Geological Summary. The renowned Krakatau (frequently mis-named as Krakatoa) volcano lies in the Sunda Strait between Java and Sumatra. Collapse of an older edifice, perhaps in 416 or 535 CE, formed a 7-km-wide caldera. Remnants of that volcano are preserved in Verlaten and Lang Islands; subsequently the Rakata, Danan, and Perbuwatan cones were formed, coalescing to create the pre-1883 Krakatau Island. Caldera collapse during the catastrophic 1883 eruption destroyed Danan and Perbuwatan, and left only a remnant of Rakata. This eruption caused more than 36,000 fatalities, most as a result of tsunamis that swept the adjacent coastlines of Sumatra and Java. Pyroclastic surges traveled 40 km across the Sunda Strait and reached the Sumatra coast. After a quiescence of less than a half century, the post-collapse cone of Anak Krakatau (Child of Krakatau) was constructed within the 1883 caldera at a point between the former Danan and Perbuwatan cones. Anak Krakatau has been the site of frequent eruptions since 1927.