"My wife... she filled the tub when the alarm went off."

Earthquakes remain one of the deadliest natural hazards due to their unpredictability and cascading secondary effects (fires, landslides, infrastructure failure). Current early warning systems (e.g., ShakeAlert, J-Alert) provide 5–60 seconds of lead time but suffer from three critical gaps: , low public engagement , and post-communication failure when cellular networks collapse.