Indonesia’s Volatile Child of Krakatau Collapsed, but Now It’s More Explosive

ANYER, Indonesia—The volcano that unleashed a tsunami and killed more than 400 people has collapsed to about a third of its previous height and is ejecting superheated magma into the sea, magnifying the power of the eruptions and sending ash more than a mile into the air.

The volcano, called Anak Krakatau, partially collapsed in a violent spasm on Dec. 22, causing a massive landslide that sent high waves barreling toward both shores of the Sunda Strait, the narrow passage between the islands of Java and Sumatra. The volcano’s cone is now about 360 feet above sea level, Indonesian officials said Saturday, reduced from more than 1,000 feet before the collapse.