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"Early models of the collapse »ó¸í´ë¿ë´ÞÀÌ»ç were based on satellite imagery that only looked at the subaerial parts of the volcano," the British Geological Survey scientist told BBC News.
Crucially, the underwater imaging has ·¹Çø®Ä«½Å¹ß=·¹Çø®Ä«½Å¹ß allowed Prof Tappin's team to revise its estimate for the volume of rock involved in the flank failure. And it's smaller than previously thought.
Calculations based on above-water measurements of what was left of the once 335m-high volcano had suggested a figure of 0.27 cubic km.
The new assessment now points to 0.19 cubic km sliding into the ocean, almost 200 million cubic metres.