Napa Earthquake: Most Powerful To Hit SF Bay Area In 25 Years? Magnitude 6.0 Earthquake Injures 172, Destroys 100 Homes, Northern California Braces For Aftershocks [PHOTOS + VIDEOS]

The Napa earthquake was the largest to shake the San Francisco Bay Area since 1989's Loma Prieta quake. That tremor reportedly caused the collapsed of part of the Bay Bridge roadway. It killed more than 62 people, said government figures.

Before the Loma Prieta quake, there had been quakes of 5.7 and 5.8 in 1983 and 1980 respectively, reports The Independent.

According to Fox News, there are thousands of small earthquakes hitting California every year. These quakes have been providing scientists with clear indications of places where faults cut the Earth's crust. California experienced 4,895 earthquakes between 1974 and 2003.

Each year, there are about 163 earthquakes. This recent Napa earthquake is, according to the USGS, "severe" for about 15,000 residents at its very epicentre. In the aftermath of the Napa earthquake, there were at least 50 aftershocks, including four which were larger than 2.0 magnitude, according to the USGS.

They also said on Twitter that 30 to 70 small aftershocks are expected over the next seven days.

Fox News reports that State Geologist John Parrish said the aftershocks will decrease in magnitude however, and that it was unlikely if a large follow-up earthquake would occur. Still, people are warned to take care from damaged buildings which might have been left susceptible to collapse from aftershocks of the Napa earthquake. Meanwhile, social media went abuzz with news of the Napa earthquake.

There was also an Instagram user who posted a video from Santa Rosa, just north of San Francisco.

Napa earthquake had his chandelier shaking at the time.

To watch a report about the tremor, see video below.