LOS ANGELES — In the bottom of the fourth inning, Dodger Stadium swayed. Rides at Disneyland were evacuated, and so were movie theaters in Los Angeles. Near Palm Springs, pools sloshed and chandeliers at a casino rocked. And in the Mojave Desert town of Ridgecrest, Calif., fires roared, power went out and grocery store shelves came crashing down.

For the second time in two days, a powerful earthquake struck Southern California on Friday night, shaking a large area already on edge, from Las Vegas to Sacramento to Los Angeles to Mexico, rattling nerves and disrupting plans on a holiday weekend. There were no reports of fatalities and no significant damage to infrastructure, but as day broke rescue crews were still surveying damage in Ridgecrest, near the earthquake’s epicenter, and putting out fires.

The 7.1-magnitude earthquake that rattled Southern California on Friday came one day after the strongest recorded quake there in 20 years — and seismologists warned that more episodes are expected.

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To a large degree, navigating life in California means making peace with Mother Nature. Wildfires and mudslides are yearly events, made worse in recent years amid climate change. But Californians live in constant awareness, if not outright fear, of the possibility of a devastating earthquake — the “Big One,” as everyone says. And so as people across Southern California woke up Saturday morning grateful for being spared this time, there was the sense that Friday night’s temblor could have been just a foretaste of something bigger. Officials were urging residents to keep supplies handy — batteries, flashlights, a pair of sneakers — if they hadn’t already.