USGS Volcano Hazards Program Volcano Update

The real-time computer system located three small earthquakes in the vicinity of Long Valley caldera since the last update at 9:16 AM (PST) on November 19. Magnitude M=0.3 and M=0.1 earthquakes at 9:16 and 11:45 PM on the 19th were located beneath the Mammoth Mountain. A M=0.5 earthquake at 3:59 AM on the 20th was located in the Sierra Nevada south of the caldera (7 miles west of Tom's Place).