As part of the earthquake process, Earth’s surface is being deformed as earthquake faults accumulate strain and slip or slowly creep over time. We use GPS to monitor this movement by measuring the precise position (within 5mm or less) of stations near active faults relative to each other. Months or years later, we occupy the same stations again. By determining how the stations have moved we calculate ground deformation. Read more »

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The USGS Earthquake Hazards Program (EHP) supports GPS data collection throughout the western U.S. through cooperative agreements with Central Washington University, University of California at Berkeley, University of Memphis, and University of Nevada at Reno. We process GPS data that we collect, as well as data from the USGS Volcano Hazards Program (VHP), our cooperator institutions, UNAVCO Inc., and other sources (see a full listing of observing agencies). These results are available on this website as time series of daily GPS positions.


Campaign GPS data collected by the EHP for earthquake and tectonic studies have provided input for many publications. We request that those using these data in their published results inform us of the the citation for inclusion in this list by contacting Jessica Murray. Raw and RINEX data files for the campaign measurements collected by our group may be obtained through the NCEDC. Please cite these data using doi:10.5066/F7NG4NRK

If using the processed positions or results of time series analysis available on this website, please cite Murray, J.R. and Svarc, J. (2017), Global Positioning System data collection, processing, and analysis conducted by the U.S. Geological Survey Earthquake Hazards Program, Seismol. Res. Lett., doi:10.1785/0220160204, which provides a detailed description of our methodology.