Google’s system uses a combination of ShakeAlert signals and proprietary technology. ShakeAlert is only used in California, Washington, and Oregon. You can read more:

- https://blog.google/products/android/earthquake-detection-an...

https://blog.google/products/android/earthquake-detection-an...

https://www.theverge.com/2021/4/28/22407676/google-expands-a...