It was at Biscuit Basin maybe a few miles away from the Old Faithful area. Apparently it just completely went and started throwing out rocks.
https://www.nps.gov/yell/learn/news/240723.htm
The parking lot and boardwalks at Biscuit Basin, located north of Old Faithful, are temporarily closed due to a hydrothermal explosion that occurred July 23. Park staff will reopen the area once deemed safe. The Grand Loop Road remains open.
https://www.nps.gov/yell/learn/news/240723.htm
The parking lot and boardwalks at Biscuit Basin, located north of Old Faithful, are temporarily closed due to a hydrothermal explosion that occurred July 23. Park staff will reopen the area once deemed safe. The Grand Loop Road remains open.