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(CNN)-BERKELEY, California (AP) -- A third small earthquake in four days rattled the San Francisco Bay Area on Saturday, but there were no reports of injuries or damage.
The temblor that struck at 9:21 a.m. had a preliminary magnitude of 3.5 and a depth of about 6.1 miles, according to the U.S. Geological Survey.
The latest earthquake was similar in magnitude and location to those that struck Wednesday and Friday.
They erupted along the Hayward Fault, which geologists believe is due for a quake in the potentially lethal 6.7 to 7.0 range.
"It could mean there's something coming, it could mean there's nothing coming," Sigala said. "It just means the area is active, more active than it's been."