Sunday's IndyCar race at Sonoma will go ahead as planned despite an overnight earthquake within the vicinity of the circuit.
A 6.0-magnitude quake struck at 3:20am local time, with the American Canyon epicenter just 15 miles from the Sonoma track.
The tremors lasted around 25 seconds and numerous smaller aftershocks have been recorded.
The quake caused fires and significant damage to buildings in the nearby town of Napa, where several race teams including Penske were evacuated from their hotels as a precaution. There were also power outages in the town of Sonoma.
Local news outlets have reported that around 80 people have been taken to hospital with minor injuries, however none of those were to fans camping at the circuit.
Track officials said that all structures at the track have been inspected and declared safe, and emergency responders will remain on-site.
The quake was the largest recorded in California since the 6.9-magnitude Loma Prieta tremblor in 1989, which was responsible for 67 deaths and over 3700 injuries.
Points leader Will Power starts Sunday's race from pole position.