March 22, 2022 — Kīlauea Keller Well sampling

Located south of Halema‘uma‘u crater, in Kīlauea south caldera region, the Keller Well is a borehole drilled in 1973 to a depth of 4,140 ft (1,262 m). Hawaii Volcano Observatory geologists measure the depth to the water table quarterly to monitor Kīlauea summit region hydrology. Photo taken on March 22, 2022, by F. Younger.