The largest Southern California quake in nearly 20 years jolted an area stretching from Sacramento to Las Vegas to Mexico as it cracked buildings, set fires, wrecked roads but only caused minor injuries.

Seismologists warned that large aftershocks were expected to continue for days, if not weeks.

The 7.1-magnitude quake struck at 8:19 p.m. Friday and was centered 11 miles (18 kilometers) from Ridgecrest, the same area of the Mojave Desert where a 6.4-magnitude temblor hit just a day earlier.

Ridgecrest, already trying to recover from Thursday’s earthquake, took the brunt of the damage. Several thousand people there were without power, and there were reports of cracked buildings.

Ridgecrest Police Chief Jed McLaughlin said two building fires — one involving a mobile home — were quickly doused. There were several reports of natural gas leaks, but the lines were shut off. Mark Ghilarducci, director of the California Office of Emergency Services, said daybreak Saturday could show even more serious damage.

Local fire and police officials said they were initially swamped by calls for medical and ambulance service. But the police chief said there was “nothing but minor injuries such as cuts and bruises, by the grace of God.”

For the second time in as many days, Ridgecrest Regional Hospital wheeled patients out of the building, some still hooked to IVs, CNN reported.

Nearby, the tiny town of Trona, with about 2,000 residents, was reported to have at least one collapsed building. Roads were buckled or blocked, and police put out a call for bottled water for residents.

State Route 178 in Kern County was closed by a rockslide and had severe cracking.

In downtown Los Angeles, 150 miles (241 kilometers) away, offices in skyscrapers rolled and rocked for at least 30 seconds.

Andrew Lippman, who lives in suburban South Pasadena, was sitting outside and reading a newspaper when Friday’s quake hit. He calculated it lasted 45 seconds.

“I could see power lines swaying,” he said.

Disneyland in Orange County and Six Flags Magic Mountain in Santa Clarita closed their rides. At the New York-New York hotel in Las Vegas, the Big Apple Coaster swayed as the earth moved.

An NBA Summer League game in Las Vegas was stopped after the quake. Speakers over the court at the Thomas & Mack Center continued swaying more than 10 minutes after it was over.

In Los Angeles, the earthquake rattled Dodger Stadium in the fourth inning of the team’s game against the San Diego Padres. But the game went on, and the Padres won, 3-2.

“Not many people can say they threw a strike during an earthquake,” Eric Lauer, who was on the mound at the time, said later. “My ball, my pitch, started an earthquake.”

“Everyone was jumping over us to leave,” said Daniel Earle, 52, of Playa del Rey, who was sitting with his wife in the stadium’s reserve level. “My wife was holding us, like squeezing. I’m surprised my arm is still here.”

Friday’s quake was followed by a series of large and small aftershocks, including a few above magnitude 5.0.

Southern California can expect more significant shaking in the near future, said Lucy Jones, a seismologist at the California Institute of Technology and a former science adviser at the U.S. Geological Survey.

There is about a 1-in-10 chance that another 7.0 quake could hit within the next week, and chance of a 5.0-magnitude quake “is approaching certainty,” she added.

She said the new quake probably ruptured along about 25 miles (40 kilometers) of fault line and was part of a continuing sequence. The seismic activity is unlikely to affect fault lines outside of the area, Jones said, noting that the gigantic San Andreas Fault is far away.

Gov. Gavin Newsom activated the state Office of Emergency Services operations center “to its highest level” and announced he had requested that President Donald Trump issue an emergency declaration so the state could receive federal aid.

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