Inland San Diego County has experienced a series of small earthquakes, according to the U.S. Geological Survey.
The Julian area was hit by a 4.0 magnitude quake Wednesday afternoon, followed by a 3.0 quake and two 3.6 quakes. The latest one occurred at 2:32 a.m. Thursday.
No damage or injuries were reported.
The 4.0 quake was felt over a large area of the county, especially inland.