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Kilauea, Hilo, Hawaiʻi County, Hawaii, United States of America (Island of Hawai'i territorial waters) (19.41386 -155.27581)
It is the second youngest product of the Hawaiian hotspot and the current eruptive center of the Hawaiian–Emperor seamount chain. Because it lacks topographic prominence and its activities historically coincided with those of Mauna Loa, Kīlauea was once thought to be a satellite of its much larger neighbor. Structurally, Kīlauea has a large, fairly recently formed caldera at its summit and two active rift zones, one extending 125 km (78 mi) east and the other 35 km (22 mi) west, as an active fault of unknown depth moving vertically an average of 2 to 20 mm (0.1 to 0.8 in) per year.
Mauna Kea, Hilo, Hawaiʻi County, Hawaii, United States of America (Island of Hawai'i territorial waters) (19.82069 -155.46804)
Coordinates: 19.82064 -155.46809 19.82074 -155.46799 - Minimum elevation: 2,912 m - Maximum elevation: 4,213 m - Average elevation: 3,629 m