ACAPULCO, Mexico -- A magnitude-7.2 earthquake shook central and southern Mexico on Friday, sending panicked people into the streets. Some walls cracked and fell, but there were no reports of major damage or casualties.

The U.S. Geological Survey said the quake at about 9:30 a.m. was centered on a long-dormant fault line northwest of the Pacific resort of Acapulco, where many Mexicans are vacationing for the Easter holiday.

It was felt across at least a half-dozen states and Mexico's capital, where it collapsed several walls and left large cracks in some facades. Debris covered sidewalks around the city.

Around the region, there were reports of isolated and minor damage, such as fallen fences, trees and broken windows. Chilpancingo, capital of the southern state of Guerrero, where the quake was centered, reported a power outage, but service was restored after 15 minutes.

In Acapulco, 59-year-old Enedina Ramirez Perez was having breakfast, enjoying the holiday with about 20 family members, when her hotel started to shake.

"People were turning over chairs in their desperation to get out, grabbing children, trampling people," the Mexico City woman said. "The hotel security was excellent and started calming people down. They got everyone to leave quietly."

The quake struck 170 miles southwest of Mexico City, where people fled high-rises and took to the streets, many in still in their bathrobes and pajamas.

"I started to hear the walls creak and I said, 'Let's go,' " said Rodolfo Duarte, 32, who fled his third-floor apartment.

Mexico City Mayor Miguel Angel Mancera said there were small power outages from fallen transformers, but officials were working to restore the service.

The USGS initially calculated the quake's magnitude at 7.5, but later downgraded it to 7.2. It said the quake was centered 22 miles northwest of the town of Tecpan de Galeana, and was 15 miles deep.

Friday's quake occurred along a section of the Pacific Coast known as the Guerrero Seismic Gap, a 125-mile section where tectonic plates meet and have been locked, meaning huge amounts of energy are being stored up, said USGS seismologist Gavin Hayes.

The last large quake that occurred along the section was a magnitude-7.6 temblor in 1911, Hayes said.

He said scientists will watch the area more intensely because moderate quakes can destabilize the surrounding sections of seismic plate and increase the chance of a more powerful temblor.