To view the GPS velocities of a specific state, click within the political boundaries or the two letter character code of the state. In case of browser incompatibility on older systems, hypertexts links to each state are listed below:
This site is designed to give an interactive and visual representation of the data gathered and interpreted at the University of Wisconsin-Madison Geoscience department.
The initial tab contains a map of the world that allows users to easily choose the tectonic plate or geographic region that they wish to see GPS data for.
If this map is inoperable for any reason, a list of hypertext links of each plate or region has been provided that has the same functionality of the interactive map, bringing the user to the corresponding region's individual page.
When the individual region's page has been loaded, a map of that region is plotted that contains the location and relative velocities of all of the GPS receivers monitored at UW. The red arrows correspond to the direction and magnitude of that site's calculated movement. There is a scale at the bottom of the map to provide reference speed, as different states can have avery different maximum and everage movement vectors.
Below each region's map is a table containing hypertext links to the timeseries position plots of each GPS station.
Here is the generated map of Wisconsin:
We see that there is a higher concentration of GPS receivers along the eastern side of Wisconsin, and these are trending south-southwest at an approximate rate of ~2mm/year. When this data is compiled visually, it is easier to understand how plate tectonics are working on a large scale, even in geologically quieter regions.
Here is the timeseries for a GPS station in Wisconsin (DERE)
This image shows the position of the GPS site on a day to day basis, where the red dots are the daily positions with random noise filtered out, and blue circles are 20-day average locations to show a more uniform trend. There are linear fit lines placed on each graph which are a calculation of the general trend over the entire data collecting period.
GPS receivers and data are monitored at the University of Wisconsin-Madison Geoscience department by Professor Charles DeMets.
The software used for generating the maps is the Generic Mapping Tool, which is released under the GNU General Public License
Website design and interpretation by Kyle Fredericks, University of Wisconsin-Madison