(Washington, D.C.) -- U.S. Senators along the West Coast are asking the U.S. Geological Survey what's needed to finish construction of the Earthquake Early Warning System. Officials say 70-percent of seismic stations have been built in Washington state, California and Oregon. The senators want to know what's needed to finish the project and fund regular operations. The system sends a warning signal that can give people and businesses a short time to react before the shaking starts.