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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.
All of the earthquakes have been less than a 2.2 in seismic activity except for one magnitude 3.5 earthquake. This much activity has not occurred since the last time the volcano erupted for three weeks in 1984. Hawaiiâs Mauna Loa also erupted in 1975, only nine years prior.During the last eruption, Mauna Loaâs lava came within four miles of the city of Hilo.fter nearly three decades of being restful, the giant, active volcano is waking up. Over the past 13 months, the Hawaiian Volcano Observatory recorded increasing levels of seismic activity in Hawaiiâs Mauna Loa volcano.