A book in progress by Bob Dutru. Every major country in the world sent specialized teams to help. The English sent a Fireman's unit they keep for major disasters. The French sent a special dog team to help find survivors. Their Alsatians would point and stay still if there was a body buried beneath the rubble.
Children obviously have a different smell.
Unfortunately the dogs were useless after three days. The smell of death was everywhere and was by then so strong that it overpowered all other scents. I was amazed and impressed by the Mexicans. Without phones, electricity or safe running water, everyone joined in and helped. Cars, trucks, taxis all marked with a white handkerchief to distinguish them, carried the wounded to hospitals and worked as emergency bus services.