California earthquakes Tremors in Los Angel Ontario East Vale and Rancho kukamonga a series of earthquakes struck Los Angeles area on Saturday causing widespread Tremors Tremors were felt in Ontario East Vale and Rancho kukamonga alarming many residents us geological surveys preliminary data reported a 3.5 magnitude earthquake in southern Califoria californ the Quake hit the area just after 10: a.m. local time with an epicenter 3 m southeast of Ontario a small earthquake registered at a depth of 6 km followed by a stronger 3.9 magnitude Quake stay tuned for more updates on this developing story