California earthquake shakes San Francisco, Berkeley; many say it was the strongest they felt in years

An earthquake with a preliminary magnitude of 4.3 shook parts of California's Bay Area awake early Monday, with many social media users logging on to say they felt it. Residents reported feeling a sharp jolt and receiving phone alerts. While initially recorded higher, the tremor was later revised down by the USGS, which issued a green alert indicating a low likelihood of casualties or significant damage.