The natural disaster hit near Berkeley, California, as a magnitude 4.4.
A spokesman for the California Governor's Office of Emergency Services said there were no reports of harm to the region. Nor, Sanders said, have there been reports of damage to building structures caused by the moderate quake, though "there's always the possibility that there could be some" minor structural damage.
The historic luxury hotel had no damage, an employee said, declining to give her name.
Drysdale said that depending on the magnitude of a quake in the Bay Area, Sacramentans could feel it despite having no known fault lines in the area.
Gina Solis posted on CBS San Francisco's Facebook page that it rocked her home in San Rafael. "Through geologic excavations across the Hayward fault we've learned that there are earthquakes on at least the southern part of the Hayward fault every 140, 150, 160 years", said Keith Knudsen, U.S. Geological Survey.
"The real question is: is this a foreshock to something larger?" "So it's a hot spot along the fault, and today's natural disaster - this morning's quake - was the largest of that group".
The quake appears to have happened on the Hayward Fault which is becoming due for a large natural disaster. It wouldn't be a big surprise if we had a big quake on the Hayward Fault. This fault zone runs from San Pablo Bay in the north to Fremont in the south-passing through Berkeley, Oakland, Hayward and Fremont.
There hasn't been a major quake on the Hayward Fault in over 100 years. It's been 150 years since the last rupture.
The USGS calls the fault a "tectonic time bomb" which could "cause hundreds of deaths, leave thousands homeless and devastate the region's economy".