Rubble from a collapsed building crushed a car in the Xochimilco borough of Mexico City following the M 7.1 Puebla earthquake on 19 September 2017. This and other earthquakes that followed soon after triggered an early warning system. What lessons do these early warnings and earthquakes pose for disaster mitigation strategies? Credit: Elizabeth Cochran On 19 September 2017, an earthquake shook Mexico City with an intensity not felt since the same day 32 years before, when the 1985 magnitude 8.1 Michoacan earthquake killed more than 9,000 people and left more than 100,000 homeless . . .