The eruption created the modern Yellowstone Caldera, a depression spanning about 45 by 30 miles, which is now filled by lava flows and hydrothermal features. This event firmly established the cyclical nature of Yellowstone’s violent history.
Yellowstone’s Caldera-Forming Eruptions: A Look at the Supervolcano’s Explosive Past
The first occurred about 2. This event, known as the Lava Creek Eruption, expelled an astonishing 1,000 cubic kilometers of volcanic material, blanketing much of North America in ash and contributing to a volcanic winter.
1 million years ago, creating the Island Park Caldera, and the second happened around 1. This constant unrest is a critical reminder that while the next super eruption is not imminent, the volcano is very much alive and being carefully watched.
Yellowstone's Caldera-Forming Eruptions: The Island Park and Lava Creek Events
To answer when the last Yellowstone supervolcano eruption happened, one must look back beyond recorded human history to the depths of geologic time. The volcano has experienced three distinct caldera-forming eruptions in its history.
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