Overview

• Google’s internal review found that the Android Earthquake Alerts system underestimated the February 2023 quake at magnitude 4.5–4.9 instead of the actual 7.8.
• Only 469 users received the high-priority “Take Action” alert and roughly 500,000 got the lower-priority “Be Aware” notification during the first tremor.
• Updated simulations indicate that a properly tuned model could have issued 10 million Take Action warnings and 67 million Be Aware alerts.
• Following peer-reviewed studies, Google has recalibrated its detection algorithms and rolled out updates across 98 countries.
• Seismology experts are calling for greater transparency and for national early-warning networks to reinforce the Android system.