You find these green squares with arrows to a center point in different areas all over central CDMX. I thought they were street art but no, they are meeting points in case of an earthquake. There are several across the street from a high school and in the business district too.
Central Mexico City is built on an ancient lake bed that consists of layers of rock, sand and clay. At 8.0 on the Richter scale, the 1985 temblor would have wreaked havoc anywhere, but here it was a tragic perfect storm. The ground below the city center is optimal for maximizing the energy created by the shifting earth. It lasted 2 minutes and had 2 strong aftershocks. Thousands of people lost their lives that day. 🙌🏽😥
One morning in Mexico City last summer, I feel a mild swaying in the apartment, I think "maybe it's last night's pulque lingering?" (Pulque is a traditional alcoholic drink). I look over at my son, who is visiting from central Texas, where earthquakes are rare. He is looking at me, eyes wide, coffee cup stalled in midair. Nope, definitely not the pulque.
I rocked and rolled In Los Angeles and the SF Bay Area with earthquakes a few times. The worst earthquake I rode out was in Oklahoma in a top floor room of a rickety old BnB. I remember thinking, damn, if I die in Oklahoma I am going to be really pissed off.
My takeaway is you gotta live your life, but if you live in Mexico City, live in the southern part, which is built on volcanic rock, and if you live central, live low - the shaking in the higher buildings is amplified by the synergy of the seismic vibration between the lake bed itself and the earthquake waves. This is why we see old historic buildings still standing as the higher ones came crashing down in the Centro. And always always have 2 weeks worth of water in the house.
Wiki has a fascinating overview, see link below
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