The strong eruption of the Anak Krakatau volcano from Dec. 24 to 27 ratcheted down a total of 150 to 180 million cubic meters of its volume to 40 to 70 cubic meters, according to volcanologists. The height of the volcano also came down to 110 meters from 338 meters, they said.

The tsunami rattled 312.75 km of coastal area of the strait, according to the meteorology and geophysics agency.

Volcanologists said the volcano has been in a state of "strombolian" eruption since July, meaning that the volcanic activity produced frequent moderate eruptions.

The Anak Krakatau volcano, or Child of Krakatoa volcano in English, is one of the 129 active volcanoes in Indonesia, a vast archipelagic nation home to 17,500 islands and sits on a vulnerable quake-hit zone so called "the Pacific Ring of Fire."

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