A preliminary 3.9-magnitude earthquake was reported near Ontario Saturday morning after another quake, according to the U.S. Geological Survey.

Another earthquake, this time registering 3.5 on the Richter scale, struck Ontario, California on Saturday. Are they becoming more common in the state?

At 10:34 a.m., a 3.9-magnitude quake hit 3.7 miles north-northwest of Eastvale, near the 3.5-magnitude quake close to Ontario and Eastvale around a half hour earlier. the U.S Geological Survey reported.