Revision History for USGS Circular 1351 By the Yellowstone Volcano Observatory Protocols for Geologic Hazards Response by the Yellowstone Volcano Observatory ----------------------------------------------------- Version 1.0 posted online July 29, 2010 ----------------------------------------------------- Version 2.0 revised and reposted November 5, 2014 Organizational changes to both the observatory and to some of the member institutions are accounted for. YVO Member Agencies (formerly YVO partners) have expanded to include signatories to the 2012 Memorandum of Understanding. UNAVCO, the state geological surveys of Montana, Idaho and Wyoming, and the University of Wyoming were added to the previous group of partners, the U.S. Geological Survey, Yellowstone National Park, and the University of Utah. The Support Group has been eliminated from the YVO structure, as logistics are outside the responsibility of YVO. Discussions of the YVO Advisory Board and Coordinating Scientists have been removed. Figures 2, 4, 5, and 6 have been updated to reflect changes in the organization structure of YVO and the Incident Command System. ----------------------------------------------------- Version 3.0 revised and reposted June 3, 2025 Title has been renamed: "Protocols for Geological Hazards Response by the Yellowstone Volcano Observatory to Activity within the Yellowstone Volcanic System" YVO Member Agencies have expanded to include signatories to the 2025 Memorandum of Understanding. Montana State University was added to the previous group of partners: U.S. Geological Survey, Yellowstone National Park, University of Utah, EarthScope Consortium (formerly UNAVCO), Montana Bureau of Mines and Geology, Idaho Geological Survey, Wyoming State Geological Survey, and University of Wyoming. The response plan was adapted to fit the model of the overall Volcano Science Center eruption response plan (USGS Circular 1518). The YVO communications group was introduced and described. Additional example scenarios were included, and existing scenarios were expanded to include more detail. A new type of response -- to "activity with potential" -- was introduced and described. Responses to hydrothermal hazards were highlighted using the July 23, 2024, hydrothermal explosion at Biscuit Basin as an example. Figures were expanded and modified to reflect the organization of the new response structure.