Yellowstone Volcano Eruption June 30 2024 Eruption. A volcanic eruption at yellowstone is unlikely anytime soon, but evidence is growing that a violent hydrothermal, or steam, explosion is possible. Seattle, washington—some 630,000 years ago, the supervolcano beneath yellowstone national park in wyoming recorded its last catastrophic eruption, forming a caldera that nearly spans the park's width and belching a thick layer of ash, or tephra, across north america.

Discover the eruption risks of the yellowstone volcano and learn how to prepare for a volcanic explosion. That’s when observers on geyser hill in yellowstone’s upper geyser basin, near old faithful, witnessed something that hadn’t been seen for two years: