The strongest quake was a magnitude 4.4 earthquake near Lakeport in Northern California.
A smaller – but still sizeable – magnitude 3.6 earthquake hit near Warner Springs in San Diego County.
Residents across the state reported feeling the quake, the U.S. Geological Survey reported.
The quakes struck shortly after 7 a.m. PST Sunday morning.
In the past 10 days, four earthquakes of magnitude 3.0 or greater have occurred in the state, according to the LA Times.