May 13, 2024 — Annual Mauna Loa GPS campaign underway

GPS campaign equipment being staged prior to deployment on Mauna Loa for the annual survey. Temporary GPS receivers and antennas are placed on tripods centered over benchmarks, which serve as a reference point for centering of the antenna. The equipment is left in place to collect data for a couple of days at each site. To learn more about using GPS to monitor volcanoes in Hawaii, see this "Volcano Watch" article: https://www.usgs.gov/news/volcano-watch-important-point-measuring-volcanos-shape-high-precision-gnss. USGS photo by A. Ellis.