{"thcode":2,"term":{"code":1694,"name":"aviation safety","parent":530,"scope":"Effects on air transportation of natural hazards such as volcanic activity (ash plumes and volcanic clouds)."},"uf":[],"bt":[{"code":530,"name":"hazard preparedness","parent":689,"scope":"Awareness of the consequences of hazards and actions to be taken before, during, or after hazards occur or are encountered."},{"code":689,"name":"management methods","parent":734,"scope":"Techniques of judiciously controlling or directing resources for a predetermined goal."},{"code":734,"name":"methods","parent":1,"scope":"Techniques, methods, procedures, or strategies for research, management, collection, or analysis of scientific information in USGS."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[{"code":1286,"name":"volcanic activity","parent":451,"scope":"Episodes during which gases, ash, and lava (molten rock) escape from vents in the earth's crust, accompanied by minor tremors."}]}