1985 Mexico City earthquake 32 million people live in the high-risk lakebed area. As of 2005, there are still two camps where approximately eighty families are still waiting for relocation from the earthquake. Centuries-old structures have been reinforced across the city and new construction must comply with very strict codes. There are several instances of tall buildings in Mexico City incorporating earthquake-resistant engineering. A few notable examples are: the Torre Latinoamericana, one of the first buildings in Mexico City to do so, the Torre Ejecutiva Pemex, built before the 1985 earthquake, and the Torre Mayor, built in 2003. Every 19 September, in all public
1985 Mexico City earthquake their own frequencies of vibration. Those that are six to fifteen stories tall also vibrate at the 2.5-second cycle, making them act like tuning forks in the event of an earthquake. The low-frequency waves of an earthquake are amplified by the mud of the lakebed, which in turn, is amplified by the building itself. This causes these buildings to shake more violently than the earthquake proper as the earthquake progresses. Many of the older colonial buildings have survived hundreds of years on the lakebed simply because they are not tall enough to be affected by the resonance effect. The earthquake