<Tr> <Th> Discovery date </Th> <Td> 1940--US Coast and Geodetic Survey chart number 4115 </Td> </Tr> <Tr> <Th> First visit </Th> <Td> 1978 </Td> </Tr> <P> Lōihi Seamount (also known as Lōʻihi) is an active submarine volcano about 35 km (22 mi) off the southeast coast of the island of Hawaii . The top of the seamount is about 975 m (3,000 ft) below sea level . This seamount is on the flank of Mauna Loa, the largest shield volcano on Earth . Lōihi, meaning "long" in Hawaiian, is the newest volcano in the Hawaiian - Emperor seamount chain, a string of volcanoes that stretches over 5,800 km (3,600 mi) northwest of Lōʻihi . Unlike most active volcanoes in the Pacific Ocean that make up the active plate margins on the Pacific Ring of Fire, Lōʻihi and the other volcanoes of the Hawaiian - Emperor seamount chain are hotspot volcanoes and formed well away from the nearest plate boundary . Volcanoes in the Hawaiian Islands arise from the Hawaii hotspot, and as the youngest volcano in the chain, Lōihi is the only Hawaiian volcano in the deep submarine preshield stage of development . </P> <P> Lōihi began forming around 400,000 years ago and is expected to begin emerging above sea level about 10,000--100,000 years from now . At its summit, Lōʻihi Seamount stands more than 3,000 m (10,000 ft) above the seafloor, making it taller than Mount St. Helens was before its catastrophic 1980 eruption . A diverse microbial community resides around Lōihi's many hydrothermal vents . </P>

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