September 3, 2025 – Volcano monitoring GPS station on TAU Island, American Samoa

Photo of the USGS Global Positioning System (GPS) monitoring station on western Ta‘ū Island in the Manuʻa Islands of American Samoa. The station consists of a GPS unit, which can measure very slight movements of the ground, placed on a tripod that is leveled and centered over a benchmark. Together with a network of seismic stations (recording earthquake activity), this GPS station is used by the USGS Hawaiian Volcano Observatory to monitor the volcanoes of American Samoa. USGS photo by N. Deligne.