Lobby > Exhibits > Why Geysers Erupt > Underlying Geology > Another Eruption?

Yellowstone's past geologic history suggests that various types of additional eruptions may occur in the future.

The most likely type of eruption would be hydrothermal rather than volcanic. This type of explosive eruption could occur from shallow reservoirs of steam or hot water rather than molten rock, and could blast out a shallow crater more than a kilometer wide. Mary Bay, Turbid Lake, and Indian Pond are all examples of past hydrothermal explosions.

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