Yellowstone National Park, renowned for its geothermal wonders, experienced a hydrothermal explosion on Tuesday, July 23. The event happened in the Black Diamond Pool and resulted in the temporary closure of Biscuit Basin. This unexpected event captured the attention of visitors, scientists, and park officials alike. The explosion highlights the dynamic and sometimes unpredictable nature of Yellowstone’s geothermal features.
What is a hydrothermal explosion?
A hydrothermal explosion occurs when superheated water beneath the Earth’s surface rapidly transforms into steam, causing an eruption. When water trapped in the underground reservoirs is heated to extreme temperatures, it can suddenly convert to steam, expanding rapidly and causing an explosive release of energy.
Biscuit Basin
Biscuit Basin, a popular destination within Yellowstone, is known for its stunning hot springs, geysers, and colorful pools. It is part of the larger Upper Geyser Basin, which includes the famous Old Faithful. Biscuit Basin gets its name from the biscuit-like deposits that were once prevalent around Sapphire Pool before a 1959 earthquake altered the landscape.
What happened at the Yellowstone explosion?

Early Tuesday morning, park rangers and visitors reported hearing a loud explosion in Biscuit Basin. Upon investigation, it was confirmed that a hydrothermal explosion had occurred. The explosion resulted in the ejection of rocks, sediment, and hot water.
Fortunately, there were no reported injuries, as the explosion happened in the early hours when the basin was less crowded. The boardwalk was completely destroyed. The area has been temporarily closed to ensure the safety of visitors and to allow for a thorough assessment by geologists and park officials.
The science
Hydrothermal explosions are relatively rare but not unprecedented in Yellowstone’s history. In fact, a similar explosion happened in Biscuit Basin in 2009. The explosions are typically caused by a sudden change in the pressure conditions of the geothermal system. For instance, a drop in the water table or an influx of cold water. In today’s case, the exact trigger is still under investigation.
Biscuit Basin closed through summer
Biscuit Basin, including its parking lot and boardwalks, will remain closed for the rest of the summer. The Grand Loop Road, however, remains open to traffic.
There have been no reported injuries, and the full extent of the damage is still being assessed. Park staff, along with experts from the US Geological Survey (USGS), are closely monitoring the situation.
It’s important to note that no other monitoring data indicate changes in the Yellowstone region. The explosion reported today does not signify any alteration in the volcanic system, which continues to operate at normal background levels of activity.
As this is an ongoing situation, further updates will be provided as more information becomes available.
##RVT1167b


Someday that whole park is going to ‘blow up’. I won’t be there. 😀
Well, then neither will I. 😉😄
“Hell hath no fury” like a ticked off mother nature 🤯!
Thank you, Gail! 🙂 Very interesting event and, thankfully no one was hurt. Thanks again, have a great day, safe travels, and safe stays. 🙂