Mexico City revamped its building codes, and experts say the new construction will be far more resilient if another quake of that magnitude arrives. In 1985, Mexico had one earthquake-monitoring sensor; now there are about 100 solar-powered sensors across the country, said Juan Manuel Espinosa, director of the Center of Instrumentation and Seismic Registry (CIRES). These feel the quakes in the coastal region and trigger automatic alerts to a network of more than 8,000 alarms, giving residents a minute’s warning before the dangerous shock waves would hit the capital.
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