Read the following sentences: One problem, experts say, is that many [dams] were built decades ago, when less was known about what a strong earthquake could do. Engineers didn't realize then that the loose rock and soil they used to form the base of some dams could liquefy in a strong earthquake, potentially causing the top of the structure to deform and spill. State officials have determined the 220-foot-high Calaveras Dam poses a flooding threat because the base of the 92-year-old structure was built atop loose earth on the site of a previous failed dam. About 300,000 people live in a flood zone along Alameda Creel below. Based on this information, what might an earthquake cause to happen if it takes place near a dam that is poorly constructed?