Alert ^hot^ — Android Earthquake

: The system then sends alerts to users in the path of the slower, more destructive S-waves (secondary waves), giving them precious seconds to "Drop, Cover, and Hold On". Two Types of Alerts

: When a stationary phone detects the initial, fast-moving P-waves (primary waves), it sends a signal to Google's earthquake detection server along with a coarse location. android earthquake alert

The system issues two distinct types of notifications based on the estimated intensity of the shaking: Android Earthquake Alerts now available across the U.S. : The system then sends alerts to users