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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.
The biggest eruption was at Yellowstone about 2.2 million years ago. An explosive eruption produced 2,500 cubic kilometers of ash ! (Thatâs about 2,500 times more ash than Mount St. Helens erupted!).Yellowstone has had three very large eruptions in the last 2 million years. These eruptions occurred 2.2, 1.2, and 0.6 million years ago. Only four eruptions in the last 10,000 years have been assigned a Volcanic Explosivity Index of 7.They are: 1  Tambora, Indonesia 1815. 2  Baitoushan, China-Korea border, about 1050.hese eruptions occurred 2.2, 1.2, and 0.6 million years ago. Only four eruptions in the last 10,000 years have been assigned a Volcanic Explosivity Index of 7. They are: 1  Tambora, Indonesia 1815. 2  Baitoushan, China-Korea border, about 1050.