(CNN) -- A string of earthquakes and aftershocks rattled the Pacific Coast of the United States and Mexico on Sunday, including a magnitude 7.2 quake that could be felt across Baja California, Arizona, and southern California, the U.S. Geological Survey reported.
There were no immediate reports of injuries and only limited reports of damages from that quake, which struck northwestern Mexico's Baja California at 3:40 p.m. PT (6:40 p.m. ET) about 110 miles (175 kilometers) east-southeast of Tijuana, Mexico.
"We felt it for about 30 seconds. It was rolling," San Diego County sheriff's Lt. Scott Ybarrondo told CNN. "Nothing fell off the walls here, but we have reports of pictures falling off walls elsewhere in the county."
The next-largest, a magnitude 4.1 quake, rattled windows nine minutes later in Santa Rosa, California, north of San Francisco.
No damage was reported there, and Susan Potter, a USGS geophysicist, told CNN that was a separate quake from the one that struck in the Baja California desert.
Quake magnitudes: What do they mean?
Video: Quake shakes water from pool
Video: Quake felt in California
Chandeliers swung and water sloshed around in swimming pools in the Los Angeles suburbs, witnesses reported, while posters to Twitter reported feeling the quake in Phoenix, Arizona.
Capt. Steve Ruda, a spokesman for the Los Angeles city fire department, said there were isolated power outages and a few people reported trapped in elevators, but no injuries or structural damage were reported.
The Baja California quake spawned at least five aftershocks, the largest of which was a magnitude 5.1, Potter said.
The USGS initially reported that the Baja California quake had a 6.9 magnitude. The USGS upgraded the quake about an hour later.