It's a danger we live with every day.
While scientists can't predict earthquakes, seismologists are using smartphones to give us a warning that shaking has started - enough time to seek shelter. But cellphone technology does not stop there.
Google engineers are using motion sensors built into Android phones to detect earthquakes as well. All it takes is a few seconds to set up your smartphone to be ready for the next big one.
Our special docuseries "California Dreaming" explores the challenges, solutions and people striving to keep the Golden State great, and the California Dream alive. Download our app on Roku, AppleTV, FireTV or AndroidTV to watch the special now on your TV!
Want to explore how earthquakes have affected California? See our maps below:
Maps not displaying correctly? Click here to open in a new window.