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Hualalai shield volcano, seen here from the SE at the summit of Mauna Loa, rises to 2523 m. Almost the entire surface of Hualalai is covered by lava flows of Holocene age. Unlike Mauna Loa, Hualalai has been relatively inactive during historical time. It's only historical eruption took place in 1800-01, when lava flows from two vents on the NW rift zone reached the sea. This eruption was of particular volcanological interest because of the large numbers of olivine-rich nodules that were brought to the surface by the lava flows.

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