(CNN) Anak Krakatau, the Indonesia volcano that triggered a deadly tsunami a week ago, has lost two-thirds of its height, a government agency said.

The volcano's height went from 338 meters (1,108 feet) above sea level to 110 meters (360 feet), Indonesia's Center of Volcanology and Geological Hazard Mitigation said in a report.

A satellite image comparison of Anak Krakatau before and after the tsunami.

Additional eruptions from Monday to Thursday also caused the volcano to lose volume of 150 million to 180 million cubic meters (5.3 billion to 6.4 billion cubic feet), the report said. Its volume is now 40 million to 70 million cubic meters (1.4 billion to 2.5 billion cubic feet).

The December 22 tsunami was triggered by a volcanic eruption that caused a 64-hectare (158-acre) chunk of Anak Krakatau to slide into the ocean.

Government and rescue agencies cited multiple factors in the wave that struck coasts on the islands of Java and Sumatra. The eruption came at high tide during a full moon, and the Sunda Strait, which runs between Java and Sumatra, also had been experiencing high rainfall.

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