Earthquake rattles San Francisco Bay

A short, sharp earthquake rattled the San Francisco Bay Area early Monday, breaking picture frames and cracking plaster without prompting reports of injuries or major damage.

The magnitude-4.0 quake struck at 6:49 am and was centered just north of Piedmont, near Berkeley, the US Geological Survey said. It was felt in downtown San Francisco, along the peninsula and in the East Bay.

"This was a fairly small one but we should be prepared for them at all times," USGS spokeswoman Leslie Gordon said.

The shallow quake produced a sharp jolt followed by gentle rolls. People on social media reported broken clocks and picture frames.

"I was eating breakfast when the whole house shook and several picture frames propped on our mantle and on a side table in the dining room crashed to the floor," Adam Van de Water of Oakland said in an email to The Associated Press. "My heart rate spiked and stayed elevated for a few minutes until it was clear it was over."

Bay Area Rapid Transit held commuter trains for about five minutes and there were minor delays as crews checked the tracks. No damage was reported.

The quake struck on the Hayward Fault at a depth of about 3.4 miles, according to the USGS.

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