This page displays data as of yesterday at midnight UTC. For the near-real-time map and station data, go to the home page.
How to Navigate
Draw rectangle on map to select stations, zoom in/out to focus on regions, then click on the station in the sidebar to see realtime slant TEC.
Legend
GPS
GLONASS
GALILEO
BEIDOU
Earthquake
USGS Tsunami Watch
GDGPS Station