Latest inventions in science and technology
Smartphone-Based Earthquake Early Warning System
- Context: Following the recent earthquake in Venezuela, many Android users reported receiving earthquake alerts on their smartphones moments before the tremors were felt.
- Both Android and Apple iOS support earthquake and emergency alerts through built-in notification systems.
Android Earthquake Alerts Work
- Most smartphones are equipped with an accelerometer, a motion sensor used to detect device orientation and movement.
-
- The accelerometer can also detect the initial ground shaking caused by an earthquake.
- It identifies the Primary (P) waves, which travel faster than the more destructive Secondary (S) waves.
- When a phone detects possible earthquake vibrations, it anonymously sends the data to Google’s servers.
- Google analyses data from multiple nearby devices to:
- Confirm that an earthquake is occurring.
- Estimate its location and magnitude.
- Send early warning alerts to users in affected areas.
Effectiveness of the System
- According to Google:
- The system has issued around 790 million earthquake alerts.
- It has detected and warned users about more than 2,000 potentially dangerous earthquakes since April 2021.
- The technology provides valuable seconds of advance warning, allowing people to take protective actions before stronger shaking begins.
