A 5.2 magnitude earthquake struck San Diego County on Monday, with millions receiving advance warnings via the ShakeAlert system. ShakeAlert, developed by the USGS, uses a network of seismic stations to detect earthquakes and send alerts seconds before strong shaking begins, allowing people time to take protective action. The system leverages the differing speeds of seismic waves (P-waves and S-waves) to provide crucial early warning time. This successful deployment highlights the system's effectiveness in mitigating earthquake damage and injury.

Prepared by Olivia Bennett and reviewed by editorial team.