Yellowstone National Park boardwalk damaged by hydrothermal explosion near Biscuit Basin

At around 10:00 AM MST on July 23, 2024, a small hydrothermal explosion occurred in Yellowstone National Park in the Biscuit Basin thermal area, about 2.1 miles (3.5 km) northwest of Old Faithful.

Numerous videos of the event were recorded by visitors. The boardwalk was damaged, but there were no reports of injury. The explosion appears to have originated near Black Diamond Pool.

Biscuit Basin, including the parking lot and boardwalks, are temporary closed for visitor safety. The Grand Loop road remains open. Yellowstone National Park geologists are investigating the event.

Hydrothermal explosions occur when water suddenly flashes to steam underground, and they are relatively common in Yellowstone. For example, Porkchop Geyser, in Norris Geyser Basin, experienced an explosion in 1989, and a small event in Norris Geyser Basin was recorded by monitoring equipment on April 15, 2024. An explosion similar to that of today also occurred in Biscuit Basin on May 17, 2009.

More information about hydrothermal explosions is available at Hydrothermal explosions in Yellowstone National Park | U.S. Geological Survey (usgs.gov)

Monitoring data show no changes in the Yellowstone region. Today’s explosion does not reflect activity within volcanic system, which remains at normal background levels of activity. Hydrothermal explosions like that of today are not a sign of impending volcanic eruptions, and they are not caused by magma rising towards the surface.

Additional information will be provided as it becomes available.