US Department of the Interior @Interior
Since 2006, the @USGS has been working to develop earthquake early warning (EEW) systems for the U.S., with the help of several cooperating organizations. @USGS_ShakeAlert can give you those much needed seconds to react before a quake hits. https://t.co/px6eiNo9sv https://t.co/RMhvqFEZTN — PolitiTweet.org