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. The MyShake app, which is run by the Governor's Office of Emergency Services and the UC Berkeley Seismology Lab, primarily gives advance warning of a strong earthquake. This is how to prepare for and respond to an earthquake According to state officials, more than 3.7 million people have the app so far, and more than 500,000 people combined received a notification from MyShake for the two earthquakes, in some cases as much as 15 seconds before the shaking. The first earthquake happened off the northern coast of California on December 5 and measured a magnitude 7, with the second earthquake on December 9 in Nevada, with shaking felt across California. The California landmarks most at risk from a massive earthquake The new upgrades to the tool will allow more people to receive an early warning when a strong earthquake is imminent. According to state officials, the updates are: • New availability on Chromebook laptops and devices running MacOS, such as laptops and tablets• Audio messages in six languages updated to include a calm, but urgent voice: English, Spanish, Chinese, Tagalog, Korean and Vietnamese• Information for seismic activity as los as magnitude 2.5, while early warning alerts will remain only for magnitude 4.5 or higher• Ability to pinpoint precise seismic activity and identify neighborhoods, places, addresses and zip codes• New landscape orientation on compatible devices, such as tablets• Easier identification of app functionality issues