A near magnitude 4.0 earthquake was the largest and first of 13 tremors which rocked the East Bay on Wednesday morning.
A magnitude 3.8 earthquake, centered about two kilometers northeast of San Ramon, struck at 11:43 a.m, beginning a string of more than a dozen tremors ranging from magnitude 1.3 to 3.8 around the same region, the United States Geological Survey confirmed to KCBS Radio. The agency said they do not know if this was an earthquake swarm.
KCBS Radio reporter Matt Bigler said he felt the initial tremor in his San Leandro home.
"I was in the basement and definitely felt an earthquake. It was almost like a rolling sensation," he said. "I didn’t feel the usual jerk of the house."
"It was definitely a jolt," he added.
A KCBS Radio listener named Debbie, who was in a Trader Joe's parking lot in Castro Valley, told the station she thought somebody hit her car when the earthquake struck.
"It was a very strong jolt, enough that it kind of scared me," she said.
Former KCBS Radio Reporter and Editor Mark Seelig was working from his Lafayette home during the shake. "I felt enough earthquakes to know it was pretty decent but it was fast," he said. "My heart started racing and I nearly dove under the desk for a moment there, but it calmed down."
The thirteenth earthquake hit at 4:01 p.m. in the same area as the previous 12, USGS reported. It was a magnitude 2.8 quake with a depth of 10.4 km.
The earthquakes aren't expected to have caused any damage.
This is a developing story. Check back for updates.
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