California is considering a system to warn the public of approaching earthquakes. In late May the State Senate passed a bill (SB 135) to fund such a system, it now sits with the State Assembly. KRCB visited one of the centers working on the warning system to see how it works.
The video above demonstrates ShakeAlert, a desktop application that would pop up on users' computers to warn of coming quakes. Here, the system is simulating a repeat of the magnitude 7.1 Loma Prieta earthquake in 1989.