A 4.1 magnitude earthquake shook Los Angeles Saturday — a day after a 5.1 temblor hit the region.
More than 100 aftershocks have hit the southern region of the U.S. state of California since Friday's quake.
The U.S. Geological Survey has been recording the aftershocks, the largest of which appears to be a 3.4-magnitude quake that struck near the city of La Habra in Orange County.
Authorities have issued no reports of major damage or injuries from the quakes, which led to the temporary displacement of about 50 people.
Public safety crews have been inspecting bridges, dams, rail tracks and other infrastructure systems for signs of damage.
The 5.1-magnitude earthquake hit late Friday and was centered near Brea in Orange County, about 32 kilometers southeast of downtown Los Angeles. Broken glass, gas leaks, water main breaks and a rock slide were reported near the epicenter.
The earthquake followed a 4.4-magnitude quake that jolted Los Angeles last week.
California is on the so-called Ring of Fire, which circles the Pacific Ocean and has produced devastating quakes, including Japan's 2011 quake-tsunami.
Southern California has not experienced a destructive earthquake since the 6.7-magnitude Northridge quake in 1994 that killed several dozen people and caused billions of dollars worth of damage.