That’s a big hot spot under there. An eruption could be a huge disaster,
“…A thermal spring near Old Faithful in Yellowstone National Park has erupted for the fourth time in the last 60 years, a park official said Thursday.
Ear Spring on Yellowstone’s Geyser Hill went from being dormant on Saturday to spewing steam and water between 20 and 30 feet (6 and 9 meters) high, a height not recorded since 1957, said park spokesman Neal Herbert. It has since continued to erupt at a near-constant height of about 2 feet (0.6 meters), he said.
Ear Spring, named for its resemblance to the shape of a human ear, is one of dozens of geysers, pools and hot springs in Yellowstone’s Upper Geyser Basin — among the park’s top attractions that feature the popular Old Faithful. It last erupted in 2004.
The eruption is among the new thermal activity seen over the last several days on Geyser Hill, just across the Firehole River from Old Faithful…”
https://www.yahoo.com/news/yellowstone-thermal-spring-erupts-4th-time-60-years-205633388.html