August 2, 2024—Sulfur Cone gas monitoring maintenance

This photograph shows the inside of the Hawaiian Volcano Observatory (HVO) Multi-Gas site at Sulfur Cone. Currently, HVO has 2 of these continuous gas monitoring sites in operation on the Island of Hawai‘i. This one at Sulfur Cone high on Mauna Loa's Southwest Rift Zone, along with one at the summit of Kīlauea. Here is where the magic of measuring and monitoring concentrations of emitted volcanic gases (Sulfur Dioxide, Hydrogen Sulfide, Carbon Dioxide, and Water vapor) happens. Gas concentration data from these instruments are telemetered back to HVO to be viewed by HVO gas scientists. USGS photo by C. Sealing.