Napa Valley was hit with a “significant” aftershock Sunday, a week after a 6.1-magnitude earthquake rocked Northern California’s wine country, the U.S. Geological Survey reported. The magnitude-3.2 tremor struck 5 miles south of Napa early Sunday. It was just one of 90 aftershocks to hit the area. The strongest aftershock was a 3.9-magitude tremor that hit 8 miles south of Napa Tuesday morning, the Associated Press reported.

The earthquake caused as much as $1 billion in damages to wine country, and now winemakers reportedly want tourists to “pour” back in. Nearly 95 percent of the wineries have reopened.

Yusuf Topal, a Napa Valley restaurant owner, said he would normally have more than 100 reservations for Labor Day weekend. "When I look at reservations for next few days, I see 20 to 30 people. So we lost 75 percent of our customers," Topal told CBS News.

Napa Quake A 3.2-magnitude aftershock rattled Napa Valley a week after a 6.1-magnitude earthquake caused up to $1 billion in damages to the wine country. Photo: Reuters

About 170 people were injured in last week's quake, which was one of the strongest to hit the area in 25 years. More than 100,000 people were without power and 600 homes were without water after the earthquake hit, the New York Times reported.

Still, the earthquake was considered minor. “It is truly small -- small compared to what California has experienced in its recorded history,” Ross S. Stein, a geophysicist at the USGS, told the Times. The most powerful earthquake to hit California, and the continental 48 states, was in 1857 when a 7.9-magnitude quake rocked the Golden State.

Alaska also faced aftershocks Saturday after a 5.1-magnitude earthquake Saturday night, the AP reported. There were no reports of injuries or damage. 

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