The discovery means Oahu once towered above the ocean with three volcanic peaks, the researchers said. Until now, scientists thought Oahu was built by two volcanoes — Wai'anae on the west and Ko'olau on the east. "I think we may very well have had three active volcanoes in the Oahu region," said lead study author John Sinton, a geologist at the University of Hawaii at Manoa. The new volcano, named Ka'ena, was born in the deep underwater channel south of Kauai about 5 million years ago, according to the study, published May 2 in the Geological Society of America Bulletin.
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