Tamu Massif, Earth's Largest Volcano, Lurks Beneath Pacific Ocean
The world's largest volcano lurks beneath the Pacific Ocean,
researchers announced (Sept. 5) in the journal Nature Geoscience.
Called the Tamu Massif, the enormous mound dwarfs the previous record
holder, Hawaii's Mauna Loa, and is only 25 percent smaller than Olympus Mons on Mars,
the biggest volcano in Earth's solar system, said William Sager, lead
study author and a geologist at the University of Houston.
"We think this is a class of volcano that hasn't been recognized
before," Sager said. "The slopes are very shallow. If you were standing
on this thing, you would have a difficult time telling which way was
downhill."
Tamu is 400 miles (650 kilometers) wide but only about 2.5 miles (4
km) tall. It erupted for a few million years during the early Cretaceous
period, about 144 million years ago, and has been extinct since then,
the researchers report.