September 19, 1985
At 7:19 in the morning, the city of Mexico experienced a devastating earthquake of magnitude of 8.1. Thirty six hours later a second earthquake of magnitude of 7.5 occurred. The first earthquake shook buildings in Mexico City a total of three horrifying minutes. For some residents, it seemed to last an eternity.
Severe resonance oscillations of the buildings caused strain at the juncture between columns and ceiling slabs. The vertical columns were punched through the heavy floors that collapsed around them.
