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Haleakala began growing on the ocean floor roughly 1-2 million years ago. It erupted most recently in 1790 at La Perouse Bay. Hualalai is an active volcano. The resort town of Kailua is on the southwest flank of the volcano. Hualalai last erupted in 1801 and sent lava from a vent on its northeast rift down to the ocean.
so all we know about mauna kea is that it erupted at least 7 separate times between about 6000 and 4000 years ago all the above is from mauna kea volcano hawai ifeb 15 1971 mauna kea is presently a dormant volcano having last erupted about 4500 years ago however mauna kea is likely to erupt again