A 3.4-magnitude earthquake occurred, causing shaking in Contra Costa County. The quake's epicenter was located roughly 5 miles from Brentwood. This information provides some details about the earthquake's impact and location.

Further details about the quake are available from the source. The epicenter's distance from Brentwood is confirmed to be approximately 5 miles, which is a key piece of information about the earthquake's location.

The source has information about this earthquake, including its magnitude and the area that was shaken.