Two small, guano-covered islands that peek above the waves in the central North Pacific Ocean are merely the tips of our planet's largest single volcano, new research reveals.
Pūhāhonu—Hawaiian for"turtle surfacing for air"—lies about 1100 kilometers northwest of Honolulu. It is a shield volcano—a broad dome that rises about 4500 meters from the sea floor from a single source of molten rock.
From sea floor to peak, Mauna Loa, on Hawaii's Big Island, is the tallest shield volcano on Earth. But it's nowhere near as big as Pūhāhonu; a 2013 study estimates Mauna Loa's volume at 83,000 cubic kilometers. The Tamu Massif, a 4-kilometer-tall volcanic feature the size of the British Isles on the sea floor east of Japan, contains almost 7 million cubic kilometers of material and. That makes Pūhāhonu the world champion shield volcano … for now.
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