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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.
Eruption and Lahar History. Mount Baker is one of the youngest Cascade volcanoes, and erupts infrequently. Its last major eruptive period occurred about 6,600 years ago, where large portions of the flank repeatedly collapsed generating massive lahars.