It varies widely. Some volcanoes will erupt every few years or even every few months while others can go hundreds of years without an eruption. Even for one volcano activity is not regular. Major eruptions are often preceded and followed by a series of small eruptions.
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There is no record of the Yellowstone volcano erupting on January 12, 2009. The volcano has not had a major eruption for about 640,000 years, but it does experience minor volcanic activity such as geysers and hot springs.
An active volcano is a volcano that has had at least one eruption during the past 10,000 years. An active volcano might be erupting or dormant. An erupting volcano is an active volcano that is having an eruption... A dormant volcano is an active volcano that is not erupting, but supposed to erupt again.
The eruption frequency of geysers varies depending on the geyser. Some geysers erupt on a fairly predictable schedule, such as Yellowstone's Old Faithful which erupts approximately every 90 minutes. Other geysers may erupt less frequently, with some potentially going years between eruptions.
It is difficult to predict exactly when a super volcano eruption at Yellowstone National Park may occur. Geologists continue to monitor signs of volcanic activity, but there is currently no imminent threat of eruption. The last super eruption was around 640,000 years ago, so it could be hundreds or thousands of years before the next one.
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