SAN FRANCISCO (KGO) -- Tuesday's 4.3 earthquake in the East Bay occurred on the Greenville Fault east of Tassajara.
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Most people are aware of the Calavaras Fault that runs through Danville, San Ramon and Dublin.
However, back in January of 1980, a 5.5 magnitude earthquake occurred on the Greenville Fault near Livermore.
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Tuesday's shaking was felt as far south as San Jose and as far west as San Francisco.
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