Northern California Earthquake Map & Update: 170 People Injured in Strongest Quake in 25 Years

For about 20 seconds, the West Napa Fault trembled early Sunday, leaving North California, particularly the San Francisco Bay Area, reeling in the strongest earthquake to hit the area in the last 25 years.

The seismic event also caused damage to historical buildings in the wine country, and ruptured gas and water lines. About 170 people were reportedly sent to the hospital in the aftermath of the tremor, The Los Angeles Times reported.

"The 6.0-magnitude earthquake, centered about six miles south of the city of Napa, was a reminder to Californians that it takes much less than the dreaded Big One to unleash substantial damage and fray a community's nerves," the publication observed. "If there was consolation in the small towns and bucolic countryside of Napa County, home to hundreds of wineries, it was that the quake struck at 3:20 a.m., when most people were home in the relative safety of their beds."

There were no casualties reported, only injuries sustained by people, including that of a boy who was crushed by a collapsing fireplace.

As a result of the quake, California Governor Jerry Brown announced a state of emergency. "All schools in the Napa Valley Unified School District will be closed Monday. Justin Siena High School will also be closed," ABC News reported.

"We had multiple structure fires that we've been dealing with -- a total of about six," said John Callanan of the Napa Valley Fire Department. "In one of those incidents, it involved approximately six mobile homes together, so that was one single incident. Four of the six are completely damaged. The other two have suffered some major damage."

"At least 15,000 customers in and around Sonoma, Napa and Santa Rosa lost power, according to Pacific Gas and Electric Company. Roughly 7,300 were still without power as of Sunday evening," CNN noted.

Meanwhile, Jack Rochelle, director of the Napa Public Works, revealed that it will take about a week to get the area's water system back to normal. However, the water still flowing through existing pipes are still safe for drinking.

"The quake was the strongest to hit the Bay Area since 1989, when a 6.9-magnitude one struck during the World Series," the news source recalled. "The Loma Prieta earthquake caused 63 deaths, 3,757 injuries and an estimated $6 billion in property damage."

SFGate had reported that seismic instruments only recording 4-5 seconds of shaking in the Napa Region and about 10-14 seconds in different parts of San Francisco. "The length of shaking can differ depending on several factors, including type of soil and underlying rock," the site added.