An estimated 7.9 million cu. meters of lava has gushed out of the seabed to form the new landmass that has since merged with Nishinoshima Island — enough to fill Tokyo Dome six times, the Geospatial Information Authority of Japan says.
The GIAJ made the estimate by comparing aerial images of the merged island about 1,000 km south of Tokyo taken on Feb. 16 and Dec. 17.
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