PANDEGLANG: The Indonesian volcano which caused a tsunami that killed more than 400 people last week lost more than two-thirds of its height following the eruption which triggered the killer waves.

A section of Anak Krakatoa’s crater collapsed after an eruption and slid into the ocean, generating the tsunami last Saturday night.

A visual analysis by the Indonesian volcanology agency found the volcano has lost more than two-thirds of its height, an official said Saturday.

Anak Krakatoa which used to stand 338 metres (1,109 feet) high was now just 110 metres tall.

The agency estimated the volcano lost between 150 and 180 million cubic metres of material as massive amounts of rock and ash have been slowly sliding into the sea following a series of eruptions.

“Anak Krakatoa is now much shorter, usually you can see the peak from the observatory post, now you can’t,” Wawan Irawan, a senior official at the agency, told AFP.

Before and after satellite images taken by Japan’s space agency showed that a two square kilometre chunk of the volcanic island had collapsed into the water.

The volcano, whose name means Child of Krakatoa, was a new island that emerged around 1928 in the crater left by Krakatoa, whose massive 1883 eruption killed at least 36,000 people.

The crater’s status has been raised to high alert, the second-highest warning on Indonesia four-point danger scale. AFP

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