Enormous pumice raft was first spotted in the waters of Tonga in August.
Where this enormous piece of pumice came from was unclear, although scientists said it likely formed during an underwater volcanic eruption.
The satellite images, from the European Space Agency's Copernicus Sentinel-2, found traces of the eruption at the surface of the water. Because the images could be pinpointed to a specific spot in the ocean, they were then able to find the volcano responsible. The team then used seismic data to show how at the time of the eruption, there was a series of earthquakes close to the volcano.
Volcano F was found to be about 31 miles in diameter and sits just 115 feet below sea level. It is an active volcano, having last erupted in 2001. The researchers hope to carry out more detailed research on it. The 2001 eruption also led to the formation of a pumice raft, but there was no detailed research on it or its size.
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