Editor's Note: The USGS initially reported the earthquake was a magnitude-4.2, but has since downgraded the earthquake to 3.9.
An earthquake with a preliminary magnitude of 3.9 rattled the Bay Area on Thursday afternoon.
According to the U.S. Geological Survey, the quake struck at 2:41 p.m. about 2 miles southeast of Berkeley and 5 miles northwest of Oakland.
The temblor had a depth of about 6.1 miles, according to the USGS.
All BART trains have been halted or slowed due to the earthquake, a BART employee said.
Trains systemwide are stopped or are traveling slowly as train operators conduct track inspections, the employee said.
BART did not have an estimate as of 3 p.m. for when the trains will resume normal operations.