A screenshot of a Wireless Emergency Alert — similar to an Amber Alert — warning of incoming shaking. (Robert de Groot / U.S. Geological Survey) Monday's magnitude 5.2 temblor marked another success ...

Most Californians know that sinking feeling. The ground shakes, jolting you to attention. For a split second, your mind considers the possibilities: A truck driving by? Someone dropping a heavy object ...

MyShake warns of incoming earthquakes, sometimes seconds before shaking starts. The alert system was already available on iPhones, iPads and Android phones. UC Berkeley is also working to make MyShake ...