A distant quake flattened Mexico City
On this day · 19 September 1985
On September 19, 1985, a magnitude 8.0 earthquake struck off Mexico's coast and tore through a capital 220 miles away.
At 7:18 a.m. on September 19, 1985, a magnitude 8.0 earthquake ruptured the seafloor off the coast of Michoacán, where the Cocos plate grinds beneath North America. The epicenter sat more than 350 kilometers from Mexico City, yet the capital suffered the worst of it.
The reason lay underfoot. Mexico City rests on the soft sediments of an ancient lake bed, which amplified the slow seismic waves and shook tall buildings like tuning forks. Hundreds of structures collapsed; 412 came down entirely and roughly 3,124 more were badly damaged.
Official estimates placed the final death toll at 10,000 people.
The disaster reshaped Mexican life. It exposed shoddy construction, spurred tougher building codes, and galvanized a generation of citizen rescuers who dug through rubble by hand. It also helped seed the early earthquake-warning systems the country later pioneered.
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