An earthquake measuring an estimated 6.0 struck southern Napa County early Sunday with widespread reports of damage throughout the area.

This was the largest Bay Area quake since the 1989 Loma Prieta quake, which measured around a 6.9, according to the U.S. Geological Survey.

The worst damage appeared to be at the Napa Valley Mobile Home Park in Napa, where at least four homes were destroyed by fire and up to eight more were damaged, according to Napa County Fire Capt. Steve Becker. No residents were injured, but hours after the quake, the fires continued to burn.

"It's breaking my heart," said resident Linda Butler, as she surveyed the damage to her neighbor's house.

There were fires in five other areas, county fire Operations Chief John Callanan said.

There were no reports of deaths, but one child was critically injured when a fireplace collapsed, city officials said. No details on the child were available by mid-day however.

Napa schools announced they would be closed Monday, as will the private Justin-Siena. Napa Valley College said it's classes would continue Monday since the campus suffered only cosmetic damage and utilities were functioning Sunday afternoon.

Several key Napa County offices will be closed on Monday, officials said, including the County Administration Building, the Carithers Building, 650 Imperial Way and the County Library in Napa.

Elsewhere, homes and businesses suffered broken glass, overturned furniture, and some structural damage. City spokesman Barry Martin said there were about 50 known gas leaks and 30 known water leaks as of 7 a.m. PG&E and city public works crews were dealing with those.

City officials said that the water system was functioning well despite the damage and that the water is safe to drink. It could be as long as a week before all of those leaks are repaired.

In the meantime, the city has tapped its secondary water treatment plant at Lake Hennessey to pump extra water into the system and keep pressure up and replenish storage tanks.

Officials at Pacific Union College, meanwhile, said the shaking did little damage but might have stirred up sediment in its Angwin-based water system. It advised customers to turn to bottled water for drinking if the tap water appeared cloudy. Such sediment poses no danger and should settle out within 24 hours, the school said.

Downtown streets were littered with debris, particularly from older masonry buildings. Martin said city inspectors would be checking on structures this week to determine if they are safe to occupy.

"It's better that this happened in the middle of the night" rather than during the day, when the sidewalks would have been crowded with pedestrians, he said.

City Manager Mike Parness said inspectors had already "red tagged" 15 or 16 buildings by early afternoon, meaning they could not be entered without being repaired first, and "yellow tagged" a similar number, meaning the structures should be entered only with caution.

Three unreinforced masonry structures on Brown Street suffered extensive damage, he said. Other masonry structures that had been retrofitted to withstand quakes fared much better.

The Second Street Post Office suffered extensive damage to its facade and the tall windows along the front were broken out. At the historic First Presbyterian Church, which dates from 1874, a chimney toppled and the decorative window, known as the Jesus Window, shattered. At the First United Methodist Church downtown, meanwhile, part of the facade peeled away from the roof and were leaning several inches out of kilter.

The Aveda salon in downtown was inundated with water after a pipe burst in the ceiling, sending water flowing out the front door on First Street and past the feet of onlookers.

The broken water mains also turned Napa Creek near downtown into a brown, fast-flowing stream, even with several trees lying across it after being knocked down in the earthquake.

Resident Connie Ramey had both her chimneys collapse on her home on Second Street west of downtown. Ramey's home was built in 1916, 10 years after the infamous 1906 earthquake in San Francisco, and withstood the 1989 earthquake just fine, she said.

But Sunday morning's quake caused her chimneys to fall apart and crash down to the sidewalk.

"I'm a little shocked," Ramey said. "This is the biggest one that I've ever experienced in Napa. That was scary."

Ramey bought the home in 1983, and said damage to the interior was minimal - mostly overturned cabinets.

"I was lucky last time, but not this time," Ramey said.

Guests in the five-story Andaz Napa hotel, among the tallest structures in the city, were evacuated immediately after the earthquake and many remained on the sidewalk, with their luggage, even hours later, wondering where they could find alternative accommodations. Spirits seemed high, however, as staff went in and out retrieving the guests' belongings, with some joking about the quality of the wake-up call service at Napa hotels.

Guest Cheryllyn Tallman was so shaken by the experience that she was planning to head home to the East Coast immediately, cutting short her Wine County vacation by several days.

"I live in Upstate New York," she said. "We just have blizzards - and they tell you when they are coming."

After an experience like this, she said, "You just want to go home to be with family."

While there were no official evacuation orders in place Sunday morning, the Red Cross opened an emergency shelter at Crosswalk Community Church on First Street for those displaced from their homes by quake damage. Other families could wind up displaced this week as inspectors examine damaged homes.

According to the USGS, the quake was centered near the salt marshes south of Napa, off Milton Road. It occurred at a depth of about 10 km, or or about 6 miles.

The quake struck around 3:20 a.m. and was felt as far as 100 miles away. As of 8 a.m., there had been four significant aftershocks, measuring 2.5 or more, and numerous smaller ones, according to  the USGS.

City and county officials urged residents to shut off gas to homes if they do not have automatic cutoffs. Napa Public Works Director Jacques LaRochelle said some residents might lose water service temporarily until repairs can be made on leaks. There were also scattered reports of landline phone service outages, and cell coverage was spotty downtown.

LaRochelle, who lives near the epicenter of the quake, said this was the "most violent" earthquake he has ever experienced.

First and Second street downtown were closed because of extensive damage to the facades of buildings, city officials said, and there was quite a bit of broken glass throughout the area. Hours after the quake, downtown business owners were gathering to assess the damage and protect their properties.

Napa Police Capt. Steve Potter said the city appeared to be calm, but he promised to provide extra patrols to secure damaged homes and businesses.

"We will see days of high police presence," he said

The closed streets were packed with emergency vehicles from agencies around the region, gathered to offer assistance, giving the area the look of a major disaster zone. Helicopters buzzed overhead, apparently from Bay Area news organizations.

The Goodman Library downtown was showing cracks from the quake, and a chunk of the second floor wall of a building at 3rd and Brown streets fell into the parking lot below.

There were some reports of buckling on area streets and roads. The CHP said all of the major bridges appeared to be safe. There was significant damage in four spots, and officers warned motorists to be cautious in these areas as repair crews work on them: Highway 121 at 29; 121 at Cuttings Wharf; Old Sonoma Road between Congress Valley Road and Buhman Road, and Petrified Forest Road at Saxton Road.

City officials said they would be checking local bridges and other infrastructure to make sure they are safe. Building inspections will take much longer and Napa County will have to rely on personnel borrowed from other areas.

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"We have exhausted our local resources," Parness said.

Gov. Jerry Brown promised state help to Napa and other affected counties.

“My Office of Emergency Services has been on full activation since early this morning and is working closely with state and local emergency managers, first responders and transportation officials to respond to impacts to residents and critical infrastructure," Brown said in a written statement Sunday morning. "These public safety officials are doing all they can to help residents and those living in affected areas should follow their guidance and instruction.”

In the hours after the quake, unsettled residents gathered in the streets and along porches throughout town.

Thyllis Kleid, 68, said she cannot recall a worse quake in Napa. "This was the worst one," she said, "That was scary."

At the nearby 3 Palms hotel on Second Street, night manager Karen Gurnari said televisions were thrown to the floor and furniture was tossed around in her 47 rooms, which were nearly full Saturday night.

"I am so blessed that nobody got hurt," she said after checking on her guests.

Guest Ray Darrow of Los Gatos said the walls were shaking so violently in his third floor room that they hit him as he lay in bed.

Two hours after the quake, at least 35 people were waiting for treatment at Queen of the Valley Medical Center, and several ambulances were seen bringing patients in.

By 7 a.m., a hospital spokeswoman reported that more than 70 patients had sought treatment, mostly for minor cuts and bruises. There had been one person who suffered a broken hip and one other suffered a heart attack. The hospital had set up a tent on the grounds to screen and assess patients coming in for treatment.

The county's 911 system remained active through the quake despite widespread power outages, Napa police said.

PG&E reported that more than 60,000 people were without power throughout the North Bay as of 5:30 a.m.

City officials said they planned to station dumpsters at area schools on Sunday to help residents trying to clean up and dispose of debris.

Geophysicist Randy Baldwin of the USGS said the quake was followed by a series of small aftershocks and he warned residents to expect more for the next several weeks. One aftershock, nearly three hours after the main quake, measured an estimated 3.8.

"These shallow quakes tend to be followed by lots of aftershocks," he said.

There is a small chance - between 5 and 10 percent typically - of this quake being followed by another one of similar size or even larger, Baldwin,  but that chance will fade after about a week.

It is not yet clear which fault was responsible for the quake, Baldwin said. There are several significant ones nearby.

"This is a complicated area," he said.

Check here for updates as information becomes available.

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