Precursor Volcano to the Island of Oahu Discovered

May 19, 2014 1:24 PM

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Precursor Volcano to the Island of Oahu Discovered

Mānoa, HI - infoZine - The island of O‘ahu, as we know it today, is the remnants of two volcanoes, Wai‘anae and Ko‘olau. But extending almost 100 km WNW from Ka‘ena Point, the western tip of the island of O‘ahu, is a large region of shallow bathymetry, called the submarine Ka‘ena Ridge. It is that region that has now been recognized to represent a precursor volcano to the island of O‘ahu, and on whose flanks the Wai‘anae and Ko‘olau Volcanoes later formed.

Prior to the recognition of Ka‘ena Volcano, Wai‘anae Volcano was assumed to have been exceptionally large and to have formed an unusually large distance from its next oldest neighbor, Kaua‘i. “Both of these assumptions can now be revised: Wai‘anae is not as large as previously thought and Ka‘ena Vol...

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