The volcano has been erupting for a month in the ocean about 40 miles northwest of the capital, Nuku'alofa.
Last week it disrupted international air travel to the Pacific archipelago for several days.
New Zealand volcanologist Nico Fournier said he traveled by boat to within about a mile of the new island on Saturday to take a closer look.
He said it's made mainly of loose scoria and its dimensions are about 1.1 miles by 0.9 miles, and that it rises about 109 yards above the sea.
He said that once the volcano stops erupting, it will likely take the ocean no more than a few months to erode the island entirely. He said it would need to be made of lava or something more durable to survive.
Fournier, who works for New Zealand agency GNS Science, said he was able to establish that the volcano was mainly belching steam into the atmosphere, and that the small amount of ash it was sending out was rising no more than about 1.2 miles.
Fournier said the ocean around the island is likely fairly shallow, perhaps only about 328-656 feet deep. He said there is no name yet for the new island, and he has been told that any naming rights will fall to Tonga's king.
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