Overview

• The system issues roughly 60 magnitude-4.5+ alerts per month and sends about 18 million notifications to users
• Surveys reveal 85% of recipients experienced shaking, with 36% receiving alerts before ground motion began
• Analysis confirms its accuracy rivals established seismic networks such as ShakeAlert in the US and the Japan Meteorological Society’s program
• Google has refined algorithms using regional geological models and phone sensor calibrations to boost magnitude estimation precision
• The service runs automatically on most Android phones without additional hardware, extending early-warning coverage to regions lacking conventional seismic infrastructure