USArray:
The USArray component of EarthScope is a continental-scale seismic observatory
designed to provide a foundation for studies of continental lithosphere and
deep Earth structure over a wide range of scales. USArray is providing a
new insight and new data to address fundamental questions in earthquake physics
and volcanic processes. During the multi-year project the array of seismographs
will be moved across the country in large north-south strips staying in each
strip for two years.