Kīlauea summit overflight - May 13

Near Kīlauea Visitor Center, the Ha‘akulamanu trail within Hawai‘i Volcanoes National Park passes through the Sulphur Banks area. Fumaroles in this area emit different sulfur gases, including sulfur dioxide (SO₂) and hydrogen sulfide (H₂S), and are sampled approximately every three months by USGS Hawaiian Volcano Observatory gas geochemists to track long-term changes in volcanic gas chemistry at Kīlauea. USGS photo by K. Mulliken.