Kilauea in Hawaii is considered the world’s most dangerous volcano. The factors to be considered are both their intrinsic hazard and the number of lives at risk. Also taken into consideration are frequency of eruptions, potential damage to infrastructure, and air traffic. The reason a study was commissioned to find the most dangerous volcano was to assess which ones need better monitoring to predict eruptions. Being able to predict eruptions will lessen potential damage caused by the volcano.
The Yellowstone Caldera is the largest known geothermal spot on Earth. The potential of a Yellowstone eruption is 2,400 times that of Mount Saint Helens. An eruption event would have catastrophic effects and would impact the world. The caldera is tracked by the USGS, which closely monitor ground movement and earthquakes.
The cited ref in one answer DOES NOT SAY that the likelihood of a yellostone eruption is 2400 times that of Mt St Helens. One of the past supervolcano eruptions at Yellowstone erupted a volume that much larger than St Helens. The likelihood of a Yellowstone supervolcano eruption is vastly lower than another eruption of St Helens. A Yellowstone supervolcano eruption is not something that can happen tomorrow; all sorts of things, especially small-scale eruptions evacuating the underground magma chamber, must occur over hundreds if not thousands of years before the caldera can collapse and result in a supervolcano eruption.
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