During the month of October 2011, 27 earthquakes were located in the Yellowstone National Park (YNP) region. The largest was a magnitude 1.7 event on October 28 at 5:23 PM MDT, located about 5 miles southeast of Canyon Junction, YNP. No swarms were recorded in October.
Yellowstone earthquake activity continues at relatively low background levels.
Ground Deformation Summary: Slow subsidence of the caldera, which began in early 2010, continues, though the rate of subsidence appears to have diminished somewhat in recent weeks. Current deformation patterns at Yellowstone are well within historical norms.