According to the USGS, the tremor was recorded just before 1:30 p.m. at an estimated depth of 6.9 miles.
San Francisco police say no damage has been reported and they have not received any 911 calls in association with the quake.
As of 1:45 p.m., there were no current tsunami advisories or warnings in effect for the Pacific Ocean, according to the Pacific Tsunami Warning Center.
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@abc7newsBayArea live in SF and definitely felt a quick, strong jolt— Teri McCarthy (@terimcbart) August 9, 2015
@abc7newsBayArea we felt it here in Noe Valley in SF. Quick little rumbler— Matthew S. Bajko (@politicalnotes) August 9, 2015
Bay City News contributed to this report.