A U.S. Geological Survey map indicates the epicenter of a 3.9 earthquake measured in San Bernardino National Forest on Wednesday, Dec. 28, 2016.
A U.S. Geological Survey map indicates the epicenter of a 3.9 earthquake measured in San Bernardino National Forest on Wednesday, Dec. 28, 2016. USGS
A U.S. Geological Survey map indicates the epicenter of a 3.9 earthquake measured in San Bernardino National Forest on Wednesday, Dec. 28, 2016. USGS

3.9 earthquake detected in San Bernardino National Forest

December 28, 2016 11:02 AM