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SONOMA, Calif. -- The IndyCar community was jostled early Sunday morning by a 6.0 earthquake in the Napa Valley.

The epicenter was in American Canyon, which is 15 miles east of Sonoma Raceway, where the Verizon IndyCar Series is scheduled to hold its season's penultimate race later today.

"What a wake up call, scariest thing of my life," Helio Castroneves wrote on Twitter after the first shake occurred about 6:20 a.m. ET (3:20 a.m. PT).

Castroneves tweeted a photograph of the hotel's bathroom mirror shattered on the floor. He and other Team Penske officials were evacuated from the hotel.

Team Penske president Tim Cindric said he stood in the street with Castroneves, pole-sitter Will Power and others.

"Not fun," he wrote.

Cindric posted photos of damage within the hotel.

KV Racing Technology officials fear that the winery co-owned by Jimmy Vasser, which is based near the epicenter, has suffered damage.

With power outages and assorted damage, it's unclear what effect this will have on the race, which is set for 4:40 p.m. ET (NBC Sports Network).

But a statement from Sonoma Raceway said the 12-turn, 2.385-mile permanent road course and its facilities weren't damaged, and the racing activities will continue as planned.

Cavin writes for the Indianapolis Star

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