from The Conservative Treehouse:

The first three days are always critical in a major disaster. Aid agencies consider those first 48 to 72 hours as crucial for retrieving people alive, though that can be extended if they have access to food and water.
Venezuelan officials said 17 flights carrying more than 1,600 rescue team members had touched down by Saturday as rescue workers fan out in the most devastated areas. Approximately 6 million people are affected in the quake zone.
Search teams from Mexico, the U.S.A, Brazil, El Salvador, France and other countries are now on the ground. Rescuers search through partially collapsed buildings, pushing their heads into holes in pancaked concrete to search for signs of life, occasionally hearing movement and digging to locate survivors. The work is physical and emotional.