The earthquake swarm affecting the western edge of Yellowstone National Park has included more than 460 quakes so far. The University of Utah, whose seismograph stations monitor the park’s quake activity, said Monday night that 464 quakes have been recorded since June 12, including a magnitude 4.4 earthquake near West Yellowstone on June 15, which was the largest of the swarm to date.
The swarm has consisted of five quakes in the magnitude 3 range, 57 quakes in the magnitude 2 range, 238 in the magnitude 1 range, 157 in the magnitude zero range and six weaker quakes. The quakes have ranged in depth from zero to 9 miles, relative to sea level. In total, 115 people reported to the U.S. Geological Survey that they felt the June 15 earthquake near West Yellowstone. READ MORE