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A magnitude 4.5 earthquake in East Bay

PLEASANT HILL – A 4.5 magnitude earthquake shook the East Bay late Monday, according to the US Geological Survey, attacking amid a small swarm of earthquakes in the area.

The USGS said the earthquake struck exactly at 10:33 a.m. less than a mile south-southeast of Pleasant Hill at a depth of about 8½ miles. Initially measured at 4.7 but lowered to 4.5.

There were no immediate reports of injuries.

BART services were affected by the earthquake, with the train running at low speed for track inspection. Passengers are told to expect a delay of up to 20 minutes.

The quake occurred just days before the 30th anniversary of the Loma Prieta earthquake, measuring 6.9 that killed more than 60 people. It also serves as a reminder that USGS scientists have predicted a 63 percent chance of an earthquake of magnitude 6.7 or greater that attacks the Bay Area in the next 30 years.

Pleasant Hill, like most of the Gulf Region, is seismically active. The Concord Fault is located one mile northeast of the city and the Calaveras and Hayward faults are about 7.5 miles and 11 miles southwest respectively.

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