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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.
Notable Statistic: The May 18, 1980 blast devastated 596 square kilometers (229 square miles) and destroyed timber valued at several million dollars. This was the deadliest and most economically destructive volcanic event in the history of the United States.