Yellowstone National Park & Geology

Yellowstone National Park's supervolcano remains a subject of scientific interest, with its last major eruption occurring approximately 640,000 years ago. Recent studies have identified a volatile-rich magma cap about 3.8 kilometers beneath the surface, which may help prevent large eruptions by trapping heat and pressure .news.com.auscitechdaily.com+2people.com+2news.rice.edu+2

On May 31, 2025, a small hydrothermal eruption was recorded at Black Diamond Pool in Biscuit Basin—the first since a significant explosion in July 2024 that ejected steam and debris, leading to area closures . These hydrothermal events, while dramatic, are not indicative of impending volcanic activity. The U.S. Geological Survey reports that seismicity, ground deformation, and gas emissions remain at normal background levels .sacbee.com+3mrt.com+3volcanoes.usgs.gov+3apnews.com

Old Faithfull

Yellowstone continues to be closely monitored, ensuring both scientific understanding and visitor safety.