There is currently an earthquake swarm hitting Mammoth Lakes in California. The series, which included a Magnitude 3.9 quake on Sunday, may be tied to the movement of magma in the nearby Long Valley caldera. The historically restless Mammoth Lakes area has experienced more than 150 tiny and small earthquakes over the past week, including a

magnitude 3.0 temblor that hit at 7:13 p.m. on Monday, says the USGS. The series — which included a 3. 9 quake on Sunday — may be tied to the movement of magma in the nearby Long Valley caldera, said Susan Hough, a USGS seismologist. READ MORE