"The current number of daily earthquakes is well above typical daily earthquake activity at Yellowstone. Nevertheless swarms are common at Yellowstone, with mag

"The current number of daily earthquakes is well above typical daily earthquake activity at Yellowstone. Nevertheless swarms are common at Yellowstone, with magnitudes occasionally above 4.0." "At this time, there is no reason to believe that magma has risen to a shallow level within the crust or that a volcanic eruption is likely. The current swarm earthquakes are likely the result of slip on pre-existing faults rather than underground movement of magma." http://www.seis.utah.edu/req2webdir/recenteqs/Maps/Yellowstone.html http://www.seis.utah.edu/req2webdir/recenteqs/Maps/Yellowsto... http://volcanoes.usgs.gov/yvo/ http://volcanoes.usgs.gov/yvo/ http://volcanoes.usgs.gov/yvo/publications/2010/10swarm.php http://volcanoes.usgs.gov/yvo/publications/2010/10swarm.php