Markagunt Plateau Volcanic Field | U.S. Geological Survey Official websites use .gov .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS lock ( or means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. Markagunt Plateau Volcanic Field Find U.S. Volcano Filters The map displays volcanoes, earthquakes, monitoring instruments, and past lava flows. Get Help Earthquake Plots To view an earthquake cross-sectional plot, click "Draw Plot" to start drawing on the map. Once the plot area is selected, click on "View Plot" to view chart or "Clear Plot" to start over. Map Layers Earthquake Colors Earthquake Depth Units Earthquake Time Units Results Filters The map displays volcanoes, earthquakes, monitoring instruments, and past lava flows. Get Help Earthquake Plots To view an earthquake cross-sectional plot, click "Draw Plot" to start drawing on the map. Once the plot area is selected, click on "View Plot" to view chart or "Clear Plot" to start over. Settings Map Layers Earthquake Colors Earthquake Depth Units Earthquake Time Units Map Legend Map Legend Results Markagunt Plateau Volcanic Field Publications Maps Connect The Markagunt Plateau volcanic field, located in southwestern Utah, east of Cedar City, is part of a belt of Pleistocene-Holocene volcanic fields that extends from the northern Grand Canyon in Arizona to central Utah near Fillmore. Quick Facts Location: Utah; Kane, Iron, and Garfield Counties Latitude: 37.58° N Longitude: 112.67° W Elevation: 2,840 (m) 9,318 (f) Volcano type: volcanic field Composition: basalt to rhyolite Most recent eruption: Holocene Nearby towns: Cedar City Threat Potential: Low/Very Low* *based on the National Volcano Early Warning System Summary This 3,000 km (1,160 mi ) volcanic field is within the eastern Utah Transition Zone or High Plateaus Province, a zone of tectonic extension between the Basin and Range Province to the west and the Colorado Plateau to the east. The primarily basaltic eruptions from the Markagunt Plateau were active from 5.3 Ma to less than 10 ka and occurred as 40-50 cinder cones and flows as one-off (monogenetic) events. The volcanic field formed in three eruptive episodes: 5.3 – 2.8 Ma, 1 – 0.5 Ma, and less than 0.5 Ma – less than 37 ka. The oldest eruptions formed near the town of Panguitch, Utah, at 5.3 to 5 Ma and are composed of entirely basaltic cinder cones and flows. The youngest group of eruptions includes the relatively unvegetated Dry Valley and Panguitch Lake flows that were probably erupted in Holocene time. These flows form large blocky flow fronts that range from 30 – 60 m (100 – 200 ft) high. October 22, 2018 2018 update to the U.S. Geological Survey national volcanic threat assessment 2018 update to the U.S. Geological Survey national volcanic threat assessment When erupting, all volcanoes pose a degree of risk to people and infrastructure, however, the risks are not equivalent from one volcano to another because of differences in eruptive style and geographic location. Assessing the relative threats posed by U.S. volcanoes identifies which volcanoes warrant the greatest risk-mitigation efforts by the U.S. Geological Survey and its partners... Authors John W. Ewert, Angela K. Diefenbach, David W. 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