The largest Volcano, La Garita Caldera, introduced by the video above is located in Colorado (near Creede). Can you imagine we have the biggest eruption possible supervolcano right here in the middle of the US?
Wheeler Geologic Monument (Half Moon Pass quadrangle) provides exceptional exposures of three outflow tuff sheets erupted from the San Luis caldera complex.
The San Juan Mountains are the largest erosional remnant of a composite volcanic field that covered much of the southern Rocky Mountains in middle Tertiary time. The San Juan field consists mainly of intermediate-composition lavas and breccias, erupted about 35-30 Ma from scattered central volcanoes (Conejos Formation) and overlain by voluminous ash-flow sheets erupted from caldera sources. In the central San Juan Mountains, eruption of at least 8,800 km3 of dacitic-rhyolitic magma as nine major ash flow sheets (individually 150-5,000 km3) was accompanied by recurrent caldera subsidence between 28.3 Ma and about 26.5 Ma. Voluminous andesitic-dacitic lavas and breccias erupted from central volcanoes prior to the ash-flow eruptions, and similar lava eruptions continued within and adjacent to the calderas during the period of more silicic explosive volcanism. Exposed calderas vary in size from 10 to 75 km in maximum dimension; the largest calderas are associated with the most voluminous eruptions.
There is also another supervolcano located in the middle of the US.
VEI-7 Volcano, Valles Caldera in New Mexico got a huge eruption 1.2 million years ago. Now, City of Los Alamos and Los Alamos National Laboratory are right on the Super Volcano!
Valles Caldera (or Jemez Caldera) is a 13.7-mile (22.0 km) wide extinct volcanic caldera in the … The Toledo and Valles Calderas formed during eruptions 1.61 million and 1.2 million years ago, respectively. … VEI-7 volcanoes