During an emergency, such as an earthquake, interface fire or other natural or man-made disasters, amateur radio is used to provide continuity of communications. The communication infrastructure of an area can be heavily compromised during a disaster. Cellular systems as well as land-lines may be overwhelmed, damaged, or even destroyed. This interruption in communications places immense strains on rescue personal, government agencies, and volunteer organizations as they try to provide relief to those that are affected. Local radio clubs form emergency groups that practice and train for emergency communications.