By Nelson BocanegraPEREIRA, Colombia, Aug 12 (Reuters) - When Julio Cesar Largo's daughter failed to show up for her son's birthday celebration, his worst fears took hold. On the same ‌day, a powerful earthquake had ripped through a large part of Colombia. Advertisement AdvertisementAdvertisement AdvertisementLargo hoped his daughter, 32-year-old Daniela, had simply been delayed on the bus ride home to Riosucio, a town in Caldas province in western Colombia. People who saw it ​told ​them they had seen Daniela on the morning of ​the earthquake. Instead, Daniela spent nearly 38 hours trapped beneath slabs of concrete after the four-story building she was in pancaked to the ground.