California
California Earthquake Warning System Gets Upgrade for the 'Big One'
New GPS sensors mean that people will get more rapid and accurate information about the severity of an earthquake.
People living in California will get more timely and accurate alerts about mega earthquakes with a new upgrade to the state's early warning system.
The U.S. Geological Survey (USGS) and EarthScope have started using GPS sensors in the ShakeAlert syst... [3226 chars]