California’s Earthquake Early Warning System delivered advance alerts to more than one million people before the shaking began, according to Governor Gavin Newsom.

The first-of-its-kind Earthquake Early Warning System provided advance notice before a 5.6-magnitude earthquake struck Mendocino County in Northern California yesterday morning.

The Governor’s Office of Emergency Services (Cal OES) estimates that hundreds of thousands more received wireless emergency alerts on devices that have integrated earthquake early warning alert software built into their operating systems.

The earthquake, centered 7.5 miles east of Willits in the Mendocino Range, was felt across wide areas of Northern California just after 8 a.m., including the greater San Francisco Bay Area and Sacramento region.

The state reached a major milestone this week as the MyShake App surpassed 4.5 million downloads.

Since its inception, the app has delivered more than 6.8 million alerts for 194 earthquakes. More than 60% of the system’s 1,064 sensors have been installed since the program launched, making the system more accurate and faster at delivering alerts.

The Earthquake Early Warning System is now available in Oregon and Washington.