A preliminary 3.6 magnitude earthquake hit El Cerrito, California early Saturday morning, said the United States Geological Survey (USGS).

The earthquake struck at approximately 3:39 a.m. PT aftershocks hitting the Bay Area, including San Francisco, Berkeley, and Oakland.

It was initially graded with a magnitude of 4.0 but was eventually downgraded later Saturday morning.

3.6 Magnitude Earthquake
A map view of the 3.6 earthquake which hit El Cerrito early Saturday morning Google Maps

The USGS also provided a tectonic summary of the earthquake, saying that the Hayward Fault could be responsible for the seismic shake. The most recent major earthquake on the Hayward Fault occurred in 1868, with its epicenter in the heart of the Bay Area.

USGS then noted that the Bay Area had the "largest population on the west coast with a total of 260,000 residents at the time. This earthquake was one of the most destructive in California history and remained the nation's 12th most lethal earthquake."

There have been no reports of noticeable damage or injuries said the San Francisco Chronicle, The Berkley Lab had tweeted after the shaking ended, "And we're awake now... Did you feel that?"

The previous earthquake to strike the area was Oct. 21, when a 5.1 magnitude earthquake jolted San Jose.