Kaʻena Ridge, also referred to as the Kaʻena Volcano, is a submerged remnant of an ancient shield volcano that is to the north of and once comprised the northern section of the Hawaiian Island of Oʻahu.

Kaʻena Ridge
Kaʻena Ridge Location of Kaʻena Volcano in the Hawaiian Islands
Highest point
Elevation	−3,937 ft (−1,200 m)
Coordinates	21°49′19″N 158°46′19″W
Geography
Location	Hawaii US
Geology
Mountain type	Submerged shield volcano
Last eruption	Pleistocene

Geology

Ka'ena Ridge was the oldest of the three volcanoes to form Oahu and it was also the shortest when it grew out of sea level. It was about 3,000 ft.[1]

Activity from Kaʻena began roughly 5 million years ago.[2][3] Despite being Oahu's oldest volcano, it broke sea level 400,000 years after the Waiʻanae did.[2] This is due to Kaʻena being built on a lower sea depth, whereas other Oahu volcanoes were built on pre-existing ridges.[3]

Around 3 million years ago, Kaʻena, Waiʻanae and Koʻolau were simultaneously emerged. Kaʻena would later submerge below sea level at an unknown date.[2]

In its current state, the crest of the Ka'ena Ridge extends 35-55 km wide and is located 75-100 km northwest of Kaena Point, the westernmost tip of Oahu.[4]

See also

• List of volcanoes in the Hawaiian – Emperor seamount chain

References

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