Weather and pollution updates on your smartphone may be routine, but did you know your Android phone could also potentially save your life during an earthquake? Google researchers have unveiled a system that transforms Android phones into earthquake early warning (EEW) devices, effectively detecting quakes worldwide.
In a study published in the journal Science, the Android Earthquake Alerts system has already identified thousands of quakes and warned millions across nearly 100 countries. The system uses feedback to enhance its accuracy, especially in estimating quake magnitude.
The secret lies in your phone’s accelerometer, a component that detects linear acceleration. This sensor collaborates with others like the gyroscope and compass, collectively forming the inertial measurement unit (IMU).
Earthquakes consist of non-destructive primary (P) waves and more destructive secondary (S) waves. For the alerts to function, your phone needs to be connected to Wi-Fi or a cellular network, with location and Android Earthquake Alerts enabled. This feature, however, can be turned off at the user’s discretion.
When a stationary Android phone’s accelerometer detects a P-wave, it sends data to Google’s earthquake detection server with an estimated location, while ensuring user privacy. The server checks if other phones in the area report similar signals, gauging the quake’s location and magnitude. If confirmed, alerts are sent out to users, warning them before the more destructive S-wave hits.
The system offers two types of alerts: “Be Aware” for minor tremors, and “Take Action,” which overrides the phone’s display and emits a loud alarm for significant quakes. Essentially, each Android phone acts like a mini seismometer, and together, they create an effective global EEW system.
Since its initial launch in 2021 in New Zealand and Greece, this feature is now active in 98 countries. The system has detected over 18,000 quakes, and for more than 2,000 significant ones, it has sent 790 million alerts worldwide. Google’s estimation accuracy has improved, often matching or surpassing major traditional seismic networks.
Recent examples from countries like the Philippines, Nepal, and Turkey highlight the system’s effectiveness. For example, during a 6.2 magnitude quake in Turkey in April 2025, the system issued an alert just 8 seconds after the initial tremors, providing warnings ranging from a few seconds to 20 seconds based on proximity to the epicenter.
The proliferation of Android devices—reaching 2.5 billion users—marks a 10x increase since 2019, significantly expanding access to life-saving EEW information.
