The ongoing earthquake swarm at the Yellowstone National Park supervolcano is now one of the longest ever recorded, having started on June 12. Over the past three and a half months, almost 2,500 earthquakes have been recorded in the western part of the national park. This puts it on a par with the biggest swarm ever recorded, where more than 3,000 earthquakes took place over three months. The swarm in no way signals an impending eruption, and it appears now to be coming to an end. However,

experts at the U.S. Geological Survey (USGS) say it has been “fascinating” to monitor and are eager to learn more about it in their analysis of the event. In a monthly update about activity at Yellowstone, the USGS said 115 earthquakes had been reported in the park during September. Of these, 78 were part of the ongoing swarm 6 miles north of West Yellowstone. The biggest event in the swarm last month was magnitude 2.3. FULL REPORT