University of Hawaii researchers, working with colleagues in California and France, have discovered evidence of a third major shield volcano making up the island of Oâ€˜ahu.
Previously, geologists believed the island’s current profile is the remnants of two volcanoes, Waiâ€˜anae and Koâ€˜olau. But extending almost 100 km WNW from Kaâ€˜ena Point, the western tip of the island of Oâ€˜ahu, is a large region of shallow bathymetry, called the submarine Kaâ€˜ena Ridge. It is that region that has now been recognized to represent a precursor volcano to the island of Oâ€˜ahu, and on whose flanks the Waiâ€˜anae and Koâ€˜olau Volcanoes later formed.
The team included scientists from the University of Hawaiâ€˜iâ€“MÄnoa, Laboratoire des Sciences du Climat et de Lâ€™Environment in France, and Monterey Bay Aquarium Research Institute.Read more