Here's Where to Download California's Earthquake Early Warning App

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A rescuer in an orange jumpsuit with a dog looks at a collapsed house.
A rescuer looks at a collapsed house, on October 18, 1989, in the Marina District of San Francisco, one of the areas hardest hit in the city by an earthquake estimated at 7.0 on October 17, 1989.  (Adam Teitelbaum/AFP via Getty Images)

The Great California ShakeOut safety drill occurs on the third Thursday of October each year.

Earthquake early warning alerts are publicly available throughout California, and can ideally buy people more time to protect themselves from harm.

After years of sluggish progress in developing the early warning system, Gov. Gavin Newsom unveiled MyShake statewide in 2019, to coincide with the 30th anniversary of the Loma Prieta earthquake, which ravaged the Bay Area on Oct. 17, 1989.

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In 2020, the state successfully tested its system, sending alerts to 5 million people who had downloaded UC Berkeley’s MyShake app.

The phone app warns users to “drop, cover, and hold on” if they are likely to experience shaking intensity of at least three — out of a maximum 10 — in a magnitude 4.5 or higher earthquake. Level-three shaking intensity will be felt "quite noticeably by persons indoors, especially on upper floors of buildings," according to USGS's scale.

USGS calculates that California has a 99.7% chance of being struck by at least a 6.7 magnitude earthquake within the next 30 years.

The system alerts people a few moments before a quake can be felt, so they can prepare. It uses numerous seismic stations to detect the start of an earthquake, and employs rapid communications to send the data to computers that instantly calculate the location, magnitude and intensity of shaking, sending out alerts to areas within the quake zone. The system, however, does not predict earthquakes.

Warnings produced by the ShakeAlert system are also pushed through the same wireless notification system that issues Amber Alerts.

Google announced that all Android phones will automatically receive the warnings.