A sudden eruption took place at the Indonesian Krakatau volcano at around 07:13 UTC on October 26, 2021. The Aviation Color Code was raised to Orange.
According to Anak Krakatau Volcano Observatory, the eruption was recorded on a seismogram with a maximum amplitude of 45 mm and a maximum duration of 45 seconds.
The best ground-based estimate of ash-cloud top is around 657 m (2 102 feet) above sea level, which may be higher than what can be observed clearly.1
The Alert Level remains at 2 (on a scale of 1 – 4).
Anak Krakatau on October 16, 2021. Credit: Copernicus EU/Sentinel-2, TW
The renowned volcano Krakatau (frequently misstated as Krakatoa) lies in the Sunda Strait between Java and Sumatra. The collapse of the ancestral Krakatau edifice, perhaps in 416 CE, formed a 7 km (4.3 miles) wide caldera.
Remnants of this ancestral volcano are preserved in Verlaten and Lang Islands; subsequently Rakata, Danan and Perbuwatan volcanoes were formed, coalescing to create the pre-1883 Krakatau Island. Caldera collapse during the catastrophic 1883 eruption destroyed Danan and Perbuwatan volcanoes and left only a remnant of Rakata volcano.
This eruption, the 2nd largest in Indonesia during historical time, caused more than 36 000 fatalities, most as a result of devastating tsunamis that swept the adjacent coastlines of Sumatra and Java. Pyroclastic surges traveled 40 km (25 miles) 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 cones of Danan and Perbuwatan. Anak Krakatau has been the site of frequent eruptions since 1927.2
1 Anak Krakatau VONA – 20211026/0720Z
2 Krakatau – Geological summary – GVP
Featured image: CVGHM
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