Just weeks after two major earthquakes shook California, one of them prompting a rare tsunami warning for the coast, state officials announced several upgrades to its early notification system for earthquakes, MyShake.

California's free earthquake early warning app, MyShake, is now available for Mac computers and Chromebooks — a major expansion of access for the warning system.

In the wake of two significant earthquakes that recently shook California, the California Governor's Office of Emergency Services (Cal OES) and UC Berkeley Seismology Lab have announced the expansion