This post has been updated.

A major 7.6 magnitude earthquake struck 120 miles east of Acapulco on Mexico's Pacific coast, the U.S. Geological Survey reports.  

Workers and resident gather at the Angel de la Independencia square after evacuating buildings in Mexico City during a 7.6 magnitude earthquake Tuesday. (Daruio Lopez-Mills/AP)

#mexico city airport still swaying from earthquake, a good roller.

— Nick Miroff (@NickMiroff) March 20, 2012

The quake was followed by a less powerful aftershock that was also felt in Mexico City.

The Pacific Tsunami Warning Center told Reuters that the quake would not generate a destructive tsunami, but that there could be some local tsunami effects.

Photos and video from the ground: