The Volcano Number (also Volcano Reference File Number, Volcano Numbering System, or VNUM) is a hierarchical geographical system to uniquely identify and tag volcanoes and volcanic features on Earth. The numbers consist of four numerals, a hyphen, then two or three more numerals. The first two numerals identify the region, the next two the subregion, and the last two or three the individual volcano.
The VNUM was developed by the Catalogue of the Active Volcanoes of the World project of the International Association of Volcanology, now the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI), in the late 1930s. It is currently administered by the Global Volcanism Program at the Smithsonian Institution in Washington, D.C. (USA), in cooperation with the IAVCEI, and the World Organization of Volcano Observatories (WOVO), a commission of IAVCEI.
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