earthquakes, earthquake, california earthquake, concord earthquake
Photo by USGS

The Bay Area was hit by six small earthquakes in just a few hours on Sunday afternoon, shaking homes and businesses but failing to cause any significant damage.

According to SFGate, the occurrence began with a magnitude 2.5 quake just south of Concord at about 3:01 p.m. The strongest quake, with a measured magnitude of 3.6, took place at about 3:13 p.m. It ran about nine miles deep and occurred on the Concord-Green Valley Fault, the U.S. Geographical Survey (USGS) confirmed.

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A 2.7 quake shook just one minute after the 3.6-magnitude quake, and a 2.4 quake hit the area at around 3:28 p.m. Another one with a magnitude of 1.6 shook just before 4 p.m., and the final quake which measured 2.3 took place before 7 p.m.

There were no reports of damage or injuries, Concord police said.

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The quakes were felt in places such as Pleasant Hill, Oakland and San Francisco.

USGS coordinator Jack Boatwright described the quakes as “a bit puny,” adding that scientists are trying to determine if these earthquakes are related to the magnitude 6.0 event which jarred South Napa last August, SFGate noted.

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“Even though we’re nine months after the South Napa quake, all of this activity is interesting to us,” Boatwright said. “The difficulty is we don’t know how the faults are connected.”

As the San Jose Mercury News notes, the USGS says there is a 3 to 4 percent probability of a magnitude-6.7 or higher earthquake on the Concord-Green Valley Faultin in the next 30 years. The better known Hayward Fault has a 14.3 percent chance of a similar occurrence, while there is an estimated 6.4 percent chance of an 6.7 or higher quake on the San Andreas Fault.

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