Android Earthquake Alert System (AEA)

Source:  TOI

Context: Google and UC Berkeley’s Seismology Lab have released a new global performance report of the Android Earthquake Alert (AEA) system.

• The system issued successful early warnings in 98 countries.

About Android Earthquake Alert System (AEA):

• What is AEA?
  • AEA is a crowdsourced early warning system that uses the accelerometers in Android smartphones to detect early seismic waves (P-waves) and send alerts before destructive shaking (S-waves)
• Developed By: Developed by Google in collaboration with the Seismology Laboratory of University of California, Berkeley.
• How It Works?

• • Sensor Activation: Android phones sense initial P-waves using onboard accelerometers.
  • Crowdsourcing: Data is sent to Google servers and cross-verified with signals from nearby devices.
  • Real-time Processing: If confirmed, servers estimate epicentre, magnitude, and distance.
  • Alert Dispatch: Warning is sent to users before S-waves hit, allowing 10–60 seconds of preparation.

• Key Features:

• • Dual Alert Types:
    • ‘BeAware’ for mild shaking
    • ‘TakeAction’ for strong tremors with override alerts
  • Global Coverage: Rolled out from the U.S. in 2020 to 98 countries by 2024.
  • User Impact: Issued 79 crore alerts and 79% of 1.5 lakh users found alerts highly useful.
  • Algorithm Tweaks: Reduced median error in quake magnitude estimates from 0.5 to 0.25.
  • Accessibility: Available on all Android devices with opt-in alert settings.

• Significance:

• • Democratises Disaster Warning: Extends early warning access from 25 crore to 250 crore people.
  • Zero-Cost Infrastructure: Utilises existing consumer smartphones—no additional sensors required.
  • Time-Sensitive Alerts: Provides crucial seconds for evacuation, safety, or halting transport systems.