Earthquake shakes San Francisco Bay Area; no immediate damage reported

SAN FRANCISCO, Jan 4 (Reuters) - A light earthquake shook California's San Francisco Bay Area early on Thursday, waking many, but there were no immediate reports of damage.

The U.S. Geological Survey said the shallow quake was of magnitude 4.5 and occurred at 2:39 a.m. (5:39 EST). Its epicenter was in Berkeley, across the bay from San Francisco.

A spokesman for the California Governor's Office of Emergency Services said there were no reports of harm to the region.

A Berkeley Fire Department dispatcher, who declined to give his name, said more than a dozen people had called, mostly complaining about windows shaking. He also said there were no reports of any damage or injuries.

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Active fault lines/zones in the United States -- earthquakes
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Active fault lines/zones in the United States -- earthquakes

The Alaska-Aleutian Megathrust is located across 3,600 kilometers between Kamchatka, Russia to the Gulf of Alaska.

(Photo by Daniel A. Leifheit via Getty Images)

The Cascadia Megathrust stretches along the coasts of Washington and Oregon up into Canada

(Photo via Encyclopaedia Britannica/UIG via Getty Images)

The Eastern Tennessee Seismic Zone runs from Alabama to Virginia and is responsible for four earthquakes in the past century. 

(Photo by Harrison Shull via Getty Images)

The Elsinore Fault Zone lies along the Santa Ana Mountains in Southern California

(Photo handout via NASA)

The Hayward Fault Zone runs along San Francisco Bay for 119 miles.

(Photo by Dave and Les Jacobs via Getty Images)

The Humboldt Fault (red) and the Midcontinent Rift System (green) are both located in Kansas and Nebraska. 

(Photo via Public Domain)

The Laguna Salada Fault runs from the US to Mexico and caused the 2010 Mexicali quake.

(Photo credit should read Daniel CONEJO/AFP/Getty Images)

The Moab Fault is located in Utah.

(By Andrew Wilson (Own work) [CC BY-SA 4.0], via Wikimedia Commons)

The New Madrid Fault Zone is located in Missouri.

(Photo via Public Domain)

The San Andreas Fault System runs along 1,300 kilometers in California. 

(REUTERS/NASA/JPL/Handout)

USA-EARTHQUAKE HISTORIC - Map of California visualizing earthquake activity over the past 25 years. Includes fault lines
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The USGS placed the epicenter of the earthquake next to the Claremont Club and Spa in Berkeley. The historic luxury hotel had no damage, an employee said, declining to give her name.

"Since everyone in the Bay Area is awake, it's time for the 30 minute dance party! #earthquake," a Twitter user with the name @Troop206Oakland wrote in a message, as the social media service lit up with comments, many light-hearted.

About an hour after the quake, San Francisco’s Department of Emergency Management sent a text to residents saying there was no tsunami warning. (Reporting by Peter Henderson and San Francisco Bureau reporters; Editing by John Stonestreet and Lisa Von Ahn)

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