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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.
Mount Fuji, which exhibits the greatest anomaly, is probably under great pressure, although no eruption has yet followed the Tohoku earthquake. The last time Mount Fuji erupted was on 16 December 1707, and that eruption was preceded by the violent 8.7-magnitude Hoei earthquake 49 days before. With regards to the 2011 earthquake on 11 March, it was followed by a 6.4 magnitude quake four days later. This confirmed the criticial state of Mounti Fuji to the researchers.