Nearly three dozen earthquakes have rattled the Mammoth Lakes region in less than 24 hours as the area continues to experience ripple effects of "volcanic unrest," according to the U.S. Geological Survey.
http://www.latimes.com/local/lanow/la-me-ln-earthquakes-mammoth-lakes-20140926-story.html
Actually there have been over 700 quakes in the last 24 hours: http://volcanoes.usgs.gov/volcanoes/long_valley/long_valley_monitoring_1.html