September 7, 2022 — USGS Installs GPS Stations on Ta‘ū Island in American Samoa

A USGS scientist checks the power supply at a Global Positioning System (GPS) station on Ta‘ū Island in American Samoa. The station consists of a GPS unit, which can measure changes in ground motion, placed on a tripod that is leveled and centered over a benchmark. The GPS units will complement recently-installed seismometers, which record earthquake activity occurring in American Samoa. USGS image by A. Ellis.