Earthquake Warning California is the country’s first publicly available, statewide warning system that could give California residents crucial seconds to take cover before you feel shaking. Managed by the Governor’s Office of Emergency Services (Cal OES), Earthquake Warning California uses ground motion sensors from across the state to detect earthquakes before humans can feel them and can notify Californians to “Drop, Cover and Hold On” in advance of an earthquake.
To receive earthquake warnings, individuals and family members can download the MyShake App and ensure phone settings are adjusted to receive emergency alerts, including:
MyShake App: Free smartphone app that provides iPhone and Android users with audio and visual warnings (magnitude 4.5 or higher and Modified Mercalli Intensity IV shaking). Available at in the Apple App and Google Play stores;
- Android Earthquake Alerts: Android phones with updated operating systems are automatically subscribed to Android Earthquake Alerts, which uses the same technology as the MyShake App; and
- Wireless Emergency Alerts (WEAs): No-cost text messages for emergency situations (magnitude 5.0 or higher and Modified Mercalli Intensity III shaking).
If you live in an area that could be impacted by an earthquake, preparation is vital, as these events can strike suddenly, at any time, with little warning.
Please join in the Great California ShakeOut on Oct. 15th by using Earthquake Warning California’s MyShake App to receive a test earthquake warning. The test will occur on Thursday, October 15th around 10:15am. The Great California ShakeOut is an annual opportunity to practice how to be safer during big earthquakes: "Drop, Cover and Hold On."