USGS Volcano Hazards Program Volcano Update

The real-time computer system located just one small earthquake in the vicinity of Long Valley caldera since the last update at 9:26 AM (PST) on November 20. This was a magnitude M=1.6 earthquake at 3:51 PM on the 20th centered at the depth of 5 miles beneath the eastern outskirts of Mammoth Lakes (1/4 mile north of the corrals).