3.8 earthquake shakes Antioch, felt across the East Bay

An earthquake measuring a 3.8 magnitude shook a portion of eastern Contra Costa County Wednesday evening and was felt across a number of Bay Area communities.

The quake struck at 8:35 p.m. about four miles south of Antioch in the Lone Tree Valley just east of Black Diamond Mines Regional Preserve, according to data from the U.S. Geological Survey.

There were no immediate reports of damage or injuries.

On Twitter, people across the Bay Area said they felt a sharp jolt.

"Yes! My daughter and I both heard a rumbling and thought our drapes were malfunctioning," said Celeste. "Our cats went crazy, too."

"Holy Moly that was a loud jolt!" said Ana Gotelli, who posted a surveillance video of the moment the quake hit.

"Felt it in Danville off Camino Tassajara near the Mustang Soccer Fields," said Laura Sue. "A quick jolt."

"Hard shake here in Castro Valley," said Sara Johal.

• Earthquake