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East Bay Wakes Up To Magnitude 3.6 Quake

BERKELEY (CBS SF) - The 3.6-magnitude earthquake that shook parts of the East Bay and San Francisco Thursday morning was the fourth quake in a week centered in Berkeley.

Construction crews retrofitting Memorial Stadium had just started their shifts when a jolt at 5:36 a.m. caused shaking throughout Berkeley, Alameda and San Francisco.

"The guys thought that it was just a big thing of steel that fell on the ground from above," said plumber Neil Hake.

The US Geological Survey recorded the quake 2 miles east of Berkeley with a depth of about 6 miles.

KCBS' Holly Quan Reports:

Hake said it was ironic some of the workers on the job site felt a quake that woke up parts of San Francisco while other colleagues nearby didn't notice a thing.

The same area was jolted by a pair of quakes the previous Thursday that measured 4.0 and 3.8. Those were followed by a 2.5 on Saturday night. On Wednesday, a similarly powerful quake struck near Blackhawk.

CBS SF Earthquake Section: Quake News And Preparedness Tips

Kimberly Hudson, one of the electricians laying the new electrical work for the 60,000-seat football stadium, said all the recent seismic activity put her work in perspective.

"There's a fault line that runs directly underneath our stadium here, so we are constantly being put to the test each and every time an earthquake happens," she said with a laugh.

The $321 million retrofit of the historic stadium situated above the Hayward fault is on schedule to be finished in time for the 2012 football season.

(Copyright 2011 by CBS San Francisco. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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