Update | An quake struck the Bay Area early Thursday morning along a fault line that U.S. Geological Survey scientists have called a "tectonic time bomb".
It was felt throughout the region, with people more than 150 miles away reporting to the agency that they felt the shaking for perhaps five to 10 seconds, according to officials.
The natural disaster hit the San Francisco area about 2.40am local time (11.40pm NZT) and lasted about 10 seconds, causing a "little bit of rolling motion and a sharp jolt", NBC Bay Area Chief Meteorologist Jeff Ranieri wrote on Twitter.
"You wouldn't necessarily feel an natural disaster of that size", said Drysdale speaking about the magnitude 4.4 quake.
Randy Baldwin, a geophysicist with the USGS told KTVU the quake was eight miles deep which is fairly shallow and was widely felt about 100 miles beyond the epicenter.
"Just felt everything shake here in my house in SF and our building emergency alarm went off", someone wrote on Twitter. "It's possible if the quake is big enough".
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The quake appears to have happened on the Hayward Fault which is becoming due for a large natural disaster.
He also explained that scientists are concerned about that specific fault because it's "kind of overdue".
On average, the fault produces a large quake every 160 years, with a margin of error of about 80 years.
This information comes from the USGS Earthquake Notification Service and this post was created by an algorithm written by the author. "How active is the Hayward Fault?". But for now and unless something major happens, people in Sacramento are generally safe.
The last major quake along the Hayward fault happened in October of 1868, when a magnitude 6.8 hit the San Francisco Bay region, making it the most destructive natural disaster in the state's history.