How does early warning work?

📡 Detect first

A sensor network detects the P wave near the epicenter, characterizes the quake within seconds and sends a warning before the S wave reaches places farther away.

⏱️ Seconds, not minutes

Warnings give from a few to tens of seconds. Near the epicenter there's a "blind zone" where shaking arrives before any alert can.

🌎 Real systems

Examples include SASMEX in Mexico, ShakeAlert in the U.S. and Japan's system. Android phones also have earthquake alerts based on their sensors. Turn them on in your phone.

🤝 Tremo's role

Tremo informs you as soon as an official network publishes the quake, estimates whether you'd feel it and helps you get ready. It doesn't replace official alerts: it complements them.