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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.
Mount Baker has erupted at least 10 times since 1792. Since that time there have also been 8 unconfirmed eruptions. The last confirmed eruption began September 7, 1880 and lasted about two and a half months. There may have been an eruption in 1884 but it has not been confirmed.