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Every year, there are about 500,000 earthquakes - 100,000 of which can be felt on the Earth's surface. But how do earthquakes work? We explain. USA TODAY

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A small earthquake, rated magnitude 2.7, rattled portions of northern California Tuesday morning, the U.S. Geological Survey said.

The quake, which hit at 6:32 a.m. PT, was centered near the campus of the University of California, Berkeley. 

Hundreds of residents in the area reported feeling shaking, the USGS said. 

The quake occurred along the Hayward Fault, which the U.S. Geological Survey considers to be one of the most dangerous in the world due to its proximity to heavily populated areas. 

The USGS, in a 2018 report about the fault, warned that if the fault ruptured, as many as 800 people could die and 18,000 could be injured.

There was no initial word on damage or injury resulting from Tuesday's quake, S.F. Gate said. 

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