Sinkhole in Guatemala: Giant Could Get Even Bigger
2010 sinkhole spurred by tropical storm Agatha.
The sinkhole appears to be about 60 feet (18 meters) wide and about 30 stories deep, said James Currens, a hydrogeologist at the University of Kentucky.
(See more photos of the Guatemala City sinkhole, and a Texas sinkhole picture.)
Sinkholes are natural depressions that can form when water-saturated soil and other particles become too heavy and cause the roofs of existing voids in the soil to collapse.
Another way sinkholes can form is if water enlarges a natural fracture in a limestone bedrock layer. As the crack gets bigger, the topsoil gently slumps, eventually leaving behind a sinkhole.
It's unclear which mechanism is behind the 2010 Guatemala sinkhole, but in either case the final collapse can be sudden, Currens said.