Small earthquakes centered near San Ramon continued to rattle the East Bay as they have for months Monday morning. And the largest, a 4.2M, was felt in parts of San Francisco.

San Ramon has been feeling the effects of another earthquake swarm, this one producing 17 earthquakes and counting, starting at 6:27 am. That first one in the series was a 3.8 magnitude, according to the US Geological Survey, but then several more smaller quakes were followed by a 4.2M at 7:01 am.

Another 3.8M quake came at 7:27 am, and the most recent was a 2.8M at 7:42 am.

The largest of the swarm, the 4.2M quake, was felt mildly in SF, with the Chronicle reporting on rattling windows and shaking in Glen Park and NoPa.

BART has issued an alert telling riders to expect delays throughout the system as trains are running at reduced speeds due to the quakes.

The San Ramon area has been rumbling with small earthquakes since mid-November, with a historic swarm that is apparently continuing up to today.

Photo by Jens Aber