San Francisco Bay Area residents have been shaken out of their slumber by a magnitude 4.4 earthquake that was felt over a wide area.
The quake struck at 2.39am about 2 miles (3km) from Berkeley, just across the bay from San Francisco, according to the US Geological Survey.
The magnitude was revised after it was initially reported as magnitude 4.5. It happened at a depth of 8 miles (13km).
Social media posts showed people were woken up some 40 miles (64km) to the north and south.
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.
Bay Area Rapid Transit said it had checked tracks for damage and found no problems. Early delays in train service were cleared up by 5.30am, the agency said.
Jack Boatwright, a geophysicist with the USGS Earthquake Science Center in Menlo Park, said the shaking from the quake “seemed a little weak, about half as strong as what you would expect.”
Twitter lit up with comments, many of them light-hearted.
Since everyone in the Bay Area is awake, it’s time for the 30 minute dance party! #earthquake pic.twitter.com/Z4L0sSgsK0
— Troop 206 Oakland Ca (@Troop206Oakland) January 4, 2018
*wakes up to earthquake in san francisco*
*goes back to bed*
— Taryn Arnold (@Thetarynarnold) January 4, 2018
“Since everyone in the Bay Area is awake, it’s time for the 30 minute dance party! #earthquake,” one user wrote.
Another described how the earthquake woke them up: “*wakes up to earthquake in san francisco*, *freaks out*, *checks twitter*, *goes back to bed*”
San Francisco earthquake got me like pic.twitter.com/vOLkQfQKbb
— SpiritedLA (@spiritedla) January 4, 2018
Around an hour after the quake, San Francisco’s Department of Emergency Management sent a text to residents saying there was no tsunami warning.
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