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Six people were seriously injured after a magnitude 6.1 earthquake caused significant damage in the Napa Valley early Sunday morning.

There have been numerous aftershocks, none as powerful.

An official at Queen of the Valley hospital in Napa confirmed two adults suffered heart attacks and a 13-year-old boy was seriously injured when a fireplace toppled. Three others were undergoing surgery for orthopedic injuries. In all, by late afternoon, 172 were treated at the facility mostly for cuts, bruises and bumps. It wasn't known if all of the injuries were earthquake-related.

The county coroner responded to the discovery of a body in downtown Napa a little after 11 a.m. It wasn't clear if the death was related to the earthquake.

Structural damage

Officials in the city of Napa say 15 to 16 buildings were no longer inhabitable after the quake and there was limited access to numerous other structures, mostly because of broken windows.

Among the structures damaged: the Napa County Courthouse on Brown Street; Goodman Library on First Street; San Kee Laundry Building on Main Street,Carpe Diem Wine Bar on Second Street and the Napa Senior Center.

Downtown Napa was one of the most visible indications of a strong earthquake Sunday morning. Broken building facades and windows were evident on the outside while inside buildings, fallen items from shelves and walls covered floors. News10/KXTV

California Office of Emergency Services (OES) said Sunday afternoon between 90 and 100 residences had been red-flagged, meaning they were unsafe to enter.

The California Office of Emergency Services updated conditions following Sunday's 6.1 magnitude Napa Valley quake. There were numerous power outages and water line ruptures. Good news is all fires have been extinguished. News10/KXTV

OES said structures in the city of Vallejo also sustained damage. In one case, three, five-story buildings were compromised. The Vallejo Police Department said there were reports of 16 water lines damaged.

The epicenter of a 6.0 magnitude earthquake in the Napa Valley early Sunday morning was about six miles away in American Canyon. News10/KXTV

A California geologist at the OES briefing Sunday afternoon said the earthquake had been upgraded from 6.0 magnitude to 6.1 magnitude. There have been dozens of aftershocks, the biggest being 3.6 magnitude.

The earthquake struck about 6 miles from the city of Napa. No main water transmission lines appeared to have been damaged but about 60 water distribution lines were broken, said a city official. Crews had capped 20 of them by early afternoon and were working to address the others. The officialsestimated it could take a week for water to be fully restored.

The temblor upended bottles and casks at some of Napa Valley's famed wineries and sent residents running out of their homes.

Gas leaks/ruptures

PG&E says they were repairing and/or checking approximately 100 reports of leaks and/or gas odors. In a mid-afternoon update, the utility said there were 20 earthquake-related, gas-distribution outages.

PG&E said electric service was restored to all but 10,000 customers by late afternoon. At the peak, there were 70,000 without power.

Utility spokesperson Lynsey Paulo said starting Monday, customers could call for a free safety check. The number to call is (415) 973-5002.

Napa Division Fire Chief Darren Drake says the quake caused six significant fires, including at a mobile home park. Four mobile homes were destroyed and two others damaged. Two fires in residential areas were extinguished.

Four homes in a Napa mobile home park were destroyed and two were damaged by fires early Sunday morning when gal lines ruptured during a 6.0 magnitude earthquake in the Napa Valley. News10/KXTV

Street closures

First, Second and Third streets are closed from Jefferson to Soscol and Main Street is closed from Third to Pearl streets due to damaged structures.

There are reports of buckled streets and sidewalks in the Browns Valley area and south toward Carneros. No streets are closed in these areas at this time.

Traffic concerns after the Napa earthquake

Caltrans says state roads and bridges in the area appear to be structurally sound. All damage appears to be minor; the damage on Highway 121 and Cuttings Wharf Road in Napa has been temporarily repaired, spokesperson Roquel Johnson said.

School closures

All Napa Valley Unified School District campuses and Justine Siena High School will be closed Monday, Aug. 25. The new school year started a week and a half ago.

Shelters

Red Cross opened an evacuation center. it is at Crosswalk Community Church, 2590 First Street. A second one at Florence
Douglas Center in Vallejo has since closed because all of the displaced residents found housing, the Red Cross said.

Pets can be sheltered at the Napa County Animal Shelter on Hartle Court.

The earthquake was the largest to shake the Bay Area since the 6.9-magnitude Loma Prieta quake in 1989.

PHOTOS: Earthquake strikes Napa region

Leslie Gordon of the U.S. Geological Survey says it struck at just before 3:30 a.m. Sunday about 10 miles northwest of American Canyon, southwest of Napa. This USGS Twitter tracks earthquakes and aftershocks.

MORE: What you need to know about the Napa earthquake

Mobile homes in Napa Valley caught fire after a 6.0 magnitude earthquake hit the area early morning Sunday, Aug. 24, 2014. News10

Hours after a magnitude 6.0 hit the Napa Valley, business owners go out to downtown to assess the damage caused by the quake. (Sunday, Aug. 24, 2014) News10

Gov. Brown declared a state of emergency for the entire state due to the effects of the earthquake and "continued aftershocks that have damaged critical infrastructure, homes and other structures." Earlier Sunday, Brown released a statement on the earthquake:

"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. These public safety officials are doing all they can to help residents and those living in affected areas should follow their guidance and instruction."

The shaking set off car alarms and had residents of neighboring Sonoma County running out of their houses as well. Officials say widespread power outages were also reported in Sonoma County.

Sonoma Raceway spokesperson Diana Brennan said the raceway woould open for the GoPro Grand Prix of Sonoma Verizon IndyCar Series event Sunday afternoon. The 85-lap race was slated to start at 1:40 p.m.

News10 reporter Patrick Walker gets a look at the structural damage in Downtown Napa after a 6.0 magnitude earthquake hit the area on Sunday, Aug. 24, 2014. News10

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Here is the Northern California Seismic System report on the earthquake as of 4:48 a.m.:

MAINSHOCK Magnitude : 5.96 Mw (A strong quake)
Time : 24 Aug 2014 03:20:44 AM, PDT : 24 Aug 2014 10:20:44 UTC
Coordinates : 38 deg. 12.85 min. N, 122 deg. 19.15 min. W : 38.2142 N, 122.3192 W
Depth : 6.7 miles ( 10.8 km)
Quality : Excellent
Location : 4 mi. ( 6 km) NW of American Canyon, CA : 8 mi. ( 13 km) NNW of Vallejo, CA
STRONG AFTERSHOCKS (Magnitude 5 and larger) -At this time (immediately after the mainshock) the probability of a strong and possibly damaging aftershock IN THE NEXT 7 DAYS is approximately 54 PERCENT
EARTHQUAKES LARGER THAN THE MAINSHOCK -Most likely, the recent mainshock will be the largest in the sequence. However, there is a small chance (APPROXIMATELY 5 TO 10 PERCENT) of an earthquake equal to or larger than this mainshock in the next 7 days.
WEAK AFTERSHOCKS (Magnitude 3 to 5) -In addition, approximately 30 to 70 SMALL AFTERSHOCKS are expected in the same 7-DAY PERIOD and may be felt locally.This probability report is based on the statistics of aftershocks typical for California. This is not an exact prediction, but only a rough guide to expected aftershock activity. This probability report may be revised as more information becomes available.

We'll update this post with more details as we have them.

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