The 1985 Mexico City earthquake with 8.0 magnitude is 7.9433 times bigger than the 2017 Central Mexico earthquake with magnitude 7.1.
The 1985 Mexico City earthquake struck in the early morning of 19 September at 07:17:50 (CST) with a moment magnitude of 8.0 and a Mercalli intensity of IX (Violent). The event caused serious damage to the Greater Mexico City area and the deaths of at least 5,000 people.
The 2017 Central Mexico earthquake struck at 13:14 CDT 19 September 2017 with a magnitude estimated to be Mw 7.1 and strong shaking for about 20 seconds. It caused damage in the Mexican states of Puebla, Morelos and the Greater Mexico City area, including the collapse of more than forty buildings. Mexico’s SASMEX earthquake warning system provided 20 seconds’ warning in Mexico City. 308 people have been reported killed, and more than 2633 injured.
While the full extent of the deaths in the earthquake a few days ago are not know and the intensity was less, I believe we’ll see the benefits of all the earthquake preparedness and mitigation done since 1985. I hope these events will be analyzed for lessons which will be applied in other cities at risk of earthquakes.