A magnitude 4.0 earthquake rattled the Ontario area Sunday morning, jolting some residents awake.
This comes just 5 days after a 3.1 magnitude quake struck around that area.
The 3:51 a.m. quake, measured at a depth of about 3.54 miles, was centered southeast of Ontario, according to the U.S. Geological Survey. The agency initially reported the temblor as a 4.3.
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There were no immediate reports of significant damage.
Eyewitnesses reported feeling shaking in Ontario, Pomona, La Verne, Riverside and Anaheim Hills.
A magnitude 2.5 aftershock struck the area at 4:04 a.m., the USGS said.
