Android phones can now detect earthquakes in all US states
Google is expanding its Android Earthquake Alerts system to all 50 states in the US, and six US territories. The innovative technology, which transforms smartphones into seismometers, was first introduced by Google in 2020. It is designed to provide users with a brief warning before an earthquake strikes. This expansion aims to fill the gap in regions, without a dedicated earthquake detection system like ShakeAlert.
How does the system work?
The Android Earthquake Alerts system operates by utilizing the accelerometer in smartphones, to detect initial seismic waves or P-waves. These waves precede the destructive S-waves felt during an earthquake. When a phone's sensors detect these initial waves, they transmit general location data at city-level to Google's earthquake detection server. The tech giant then determines if an earthquake of magnitude 4.5 or higher is occurring, and issues appropriate alerts to users.
Alert types and user guidance
The Android Earthquake Alerts system issues two types of alerts: 'Be Aware' and 'Take Action.' The former is a notification signaling weak or light shaking, prompting users to prepare for potential stronger shaking. The latter is a full-screen warning indicating that moderate to extreme shaking is expected, urging users to take immediate protective measures. Once the shaking subsides, users can access tips on what steps to take next.
Global reach and future improvements
The Android Earthquake Alerts system is already operational in 97 countries. The upcoming expansion will include American Samoa, Northern Mariana Islands, Puerto Rico, Guam, United States Virgin Islands, and Minor Outlying Islands. Google plans to complete this rollout "in the coming weeks." The company is also working with experts to analyze data from detected seismic events and enhance the system further.
