By Nadin Abbott

March 22, 2012 (San Diego) Updated 11 p.m.--On March 20, Mexico City was rattled by the strongest earthquake since 1985. The 1985 quake had an intensity of 8.1 on the Richter scale and lasted 90 to 120 seconds. It rattled a country that had no civil defense system to speak off, one where a halting government response left a lot to be desired.

In contrast, on Tuesday the city was shaken by a 7.8 quake. Major buildings were evacuated in good order. Damage and injuries in the urban area were kept to a minimum, while in rural areas, prompt action by authorities helped to save lives.