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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.
Scientist believe the most powerful volcanic eruption occurred approximately 2 million years ago when the Yellowstone Caldera erupted. It produced an eruption 2500 times more powerful than the May 1980 Mt. St. Helens eruption.