{"thcode":2,"term":{"code":1362,"name":"lahars","parent":639,"scope":"Downslope flow of ash and rock debris resulting from volcanic activity."},"uf":[],"bt":[{"code":639,"name":"landslides","parent":1736,"scope":"Downslope movement of rock, soil, or artificial fill under the influences of gravity."},{"code":1736,"name":"slope processes","parent":451,"scope":"The down slope movement of earth material under the influence of gravity."},{"code":451,"name":"geologic processes","parent":101,"scope":"All types of processes involving geological structures."},{"code":101,"name":"biological and physical processes","parent":1174,"scope":"All continuing activities, functions, and phenomena associated with organisms and non-living matter."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"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."}]}