Napa earthquake measuring 6.0 on the Richter scale struck northern California's Bay Area early Sunday morning. The Napa earthquake caused injuries, sparked fires, brought property damage including buildings and homes and knocked out power to tens of thousands in the area.

According to the Associated Press, the US Geological Survey (USGS) said the recent tremor is the largest quake to shake the San Francisco Bay Area in 25 years, since the 1989 Loma Prieta quake which is 6.9 in magnitude.

The Independent reports that the Napa earthquake hit four miles from its north-west the town of American Canyon in Napa County.

Along with a mobile home park catching on fire, there were reported at least 87 injuries, power outages and property damage. However, there had been no fatalities reported.

The USGS said the Napa earthquake first struck at 3:20 a.m. local time (10:20 a.m. GMT), at a depth of 6.7 miles, southwest of Napa, which led to the shaking of houses in the center of San Francisco, as far away as the Nevada border.

The Napa earthquake was reportedly given an "orange" status, which means that though there are expectedly low fatalities, there could be significant economic losses.

The report stated, "Significant damage is likely and the disaster is potentially widespread."

It added, "Overall, the population in this region resides in structures that are highly resistant to earthquake shaking, though some vulnerable structures exist."

According to NBC Bay Area, Gov. Jerry Brown has already declared southern Napa County in a state of emergency. This was reportedly after Napa fire officials said the city has exhausted its resources in extinguishing six fires, transporting injured residents, searching homes with trapped residents and answering gas leak calls, water main breaks and downed power lines.

Brown also directed state agencies to respond with equipment and personnel.

Meanwhile, President Barack Obama had been briefed on the Napa earthquake, according to the White House. Federal officials are constantly in touch with state and local emergency responders, reports the AP.

On Monday, all Napa Valley Unified School District schools will reportedly be closed for inspection on possible damage. In the meantime, the Napa Valley College will be open on the same day as it allegedly did not experience major damage.

The San Francisco Gate reports that the Napa earthquake has resulted in at least 15,000 Pacific Gas and Electric Company customers without power.

Residents' common injuries sustained included bruises, concussions, and the most common reasons were household items trembling off walls or shelves and onto people and those who stepped on debris in their homes.

President Walt Mickens of the Queen of the Valley Medical Center in Napa said, "Our community has responded in an extraordinary fashion here in Napa."

According to the hospital officials, the hospital reportedly handled more than 200 patients who sought for emergency care due to the Napa earthquake. There were 208 patients, and 17 of those were admitted having broken bones and respiratory or cardiac conditions. Meanwhile, the rest of the injured from the Napa earthquake were treated and released for less severe injuries.

Around 90 to 100 homes and businesses across the region have become uninhabitable, reports the AP as told by Director Mark Ghilarducci of the California Governor's Office of Emergency Services.

According to The Independent, the California Highway Patrol Santa Rosa had been responding to downed power poles and outages in Sonoma County. As of 4:00 a.m. on Monday, power was fortunately restored to 99 percent of those who lost it following the Napa earthquake.

Spokesman Albie Esparza for the San Francisco Police Department said, "All facilities reported no damage at this time, and operations continue normally." In the meantime, a Red Cross evacuation center had been set up at a church.

Crews are also assessing the damage to homes, bridges and roadways after the Napa earthquake. Sunday morning, Gov. Brown said his emergency services offices was on full activation and that they are working closely with emergency managers, first responders and transportation officials to assist residents as well as vital infrastructure.

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

Mike Thompson, a U.S. Rep. for Napa said federal and state officials conducted an aerial survey of the area. However, they still could not provide a cost estimate for the damage until they can get on ground and into the buildings.

Thompson said that while Napa suffered worst, significant damage can also be found about 17 miles south on Mare Island in Vallejo. Vallejo is reportedly a former naval shipyard with a museum and historic, now uninhabitable.

Thompson said, "It's bad any way you calculate it. But it could have been a heck of a lot worse."

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.