EarthScope Arrives in Illinois
Transportable Array stations that have been or are presently occupied. The Illinois stations are shown in lighter blue.
Illinois is temporary host to 30 high-quality seismograph stations as part of the EarthScope Transportable Array project. EarthScope is a program of the National Science Foundation (NSF) that deploys thousands of seismic, GPS, and other geophysical instruments to study the structure and evolution of the North American continent and the processes that cause earthquakes and volcanic eruptions. One component of EarthScope is the Transportable Array, a network of 400 seismographs that are being placed in temporary sites across the United States from west to east. Transportable Array data are extremely useful for mapping the structure of the Earth's interior. After a residence time of two years, each instrument is picked up and moved to the next location on the eastern edge of the array. The array arrived in Illinois and western Indiana this past winter. The 30 stations in Illinois will remain until the summer of 2013. When completed, nearly 2000 locations will have been occupied throughout the U.S. during this program.