Biscuit Basin in Yellowstone, United States, closed after a hydrothermal explosion

Biscuit Basin in Yellowstone National Park, United States, has been closed after a hydrothermal explosion sent debris hundreds of meters into the air and damaged the surrounding area.

The explosion destroyed the walkway surrounding Biscuit Basin. Photo: Jacob W. Frank / NPS

Biscuit Basin, located about 2 miles northwest of Wyoming's famous Old Faithful geyser, has been closed for the remainder of summer 2024 for visitor safety, according to US National Park Service officials.

The explosion, which occurred near the Sapphire Pool, destroyed the walkway surrounding the pool and threw grapefruit-sized rocks hundreds of meters away.

The Black Opal Pool was also affected.

The Grand Loop Road, which circles Biscuit Basin and other major sites in the park, will remain open to vehicles. Other nearby hot springs, such as Black Sand Basin, will also remain open.

Hydrothermal eruptions occur in the park every year, usually in more remote areas.

The recent explosion (July 23, 2024) does not indicate an imminent volcanic eruption, the USGS said.

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