Last week’s magnitude 7.1 quake caught me, and everyone in Mexico City, by surprise. We are used to getting lots of warning before an earthquake – and this time, we didn’t.
Since 1993, Mexico City has had a fully operational earthquake early warning system. When a magnitude 8.2 quake struck on 7 September, the city got over a minute of warning.
But 19 September’s quake showed that the system can’t handle all types of events. The limited warning it gave holds lessons for all countries working to give their citizens a head start.
“This event in Mexico City is critical,” says Richard Allen at the University of California, Berkeley.
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