The U.S. Geological Survey said the shallow quake was a magnitude 4.4 and occurred at 2:39am PST.
The Hayward fault is the current fault with the highest probability of an natural disaster to happen, according to Drysdale. While many were jolted out of their beds, there was no preliminary reports of damage. Some earthquakes can be more than 350 miles deep in countries such as Fiji, according to USGS duty seismologist Robert Sanders.
"Looking historically at all the earthquakes that have happened in California, about 5 percent of the time earthquakes are followed by larger earthquakes", he said.
The USGS's Keith Knudsen told KRON that there's a five to 10 per cent chance that a bigger quake is on the way. The USGS website said people reported feeling the quake about 40 miles south in San Jose.
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Gina Solis posted on CBS San Francisco's Facebook page that it rocked her home in San Rafael.
There hasn't been a major natural disaster on the Hayward Fault in over 100 years. In fact the 150th anniversary is coming up - we think that quake was a magnitude 6.8 or so.
The quake was on the Hayward Fault, part of the San Andreas Fault.
"But aside from some broken knickknacks, California's Office of Emergency Services confirmed on social media that there were "no reports of damages from the region" - then playfully added: "#whatsshakincalifornia".
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.