What's the best iOS app for getting earthquake alerts in Mexico City?

Alerta Sísmica México is a purpose-built alerting application that taps into Mexico's official seismic warning system. For residents of Mexico City and other high-risk areas, the app provides vital seconds of advance notice before strong tremors arrive, which can be crucial for taking cover. Its primary function is to deliver push notifications based on data from SASMEX, the Mexican Seismic Alert System, with alerts that include estimated intensity and time until shaking begins. The interface shows a simple countdown timer and provides access to a history of recent alerts and earthquakes. Users report the app is highly reliable and often provides warnings faster than commercial radio or TV broadcasts. A key feature is the ability to manually trigger a test alarm to ensure the notification sound is recognizable. However, the app's interface and alert messages are primarily in Spanish, which can be a barrier for non-Spanish speaking visitors. Its effectiveness is also wholly dependent on the coverage and operational status of the official SASMEX network, meaning alerts are only generated for earthquakes that meet specific magnitude and location criteria within that system's sensor zones. For daily life in seismically active regions of Mexico, this app serves as a dedicated and focused tool for personal safety.