Earthquake swarms keep rattling the Bay Area. What's going on?

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Dozens of small earthquakes have shaken the San Francisco Bay Area over the last month, rattling nerves and raising fears that more seismic events may be on the horizon.The clusters of earthquakes — the latest of which struck Monday — have all been underneath the East Bay suburb of San Ramon, which is close to the Calaveras fault.

There were at least 19 earthquakes of magnitude 2 or greater on Monday alone, with the largest, a magnitude 3.6, striking at 9:07 a.m.That quake was strong enough to unsettle customers in the checkout line at a Safeway in Dublin, leaving shoppers feeling shaking for a few seconds — just enough to look at each other in bewilderment and alarm before the rumbling stopped.

Before that, there were six earthquakes in the 5 a.m.hour, giving many across the region an unpleasant wake-up call.

“Wee bit nervous,” one person wrote on Threads, adding that she planned to stock up on water and earthquake supplies.“San Ramon is basically a massage chair today … but like, the stressful kind,” another person wrote on the social media site.

“Dear Earth: we get it, you’re active.You can stop now.”The seismic clusters began Nov.

9, when 13 earthquakes were detected — the largest being a magnitude 3.8.Two more came the next day, as well as one apiece Nov.

15, Nov.17, Nov.

18 and Nov.20.

As if Bay Area residents weren’t already on edge, a magnitude 2.9 earthquake ruptured at 2:55 p.m.Monday with an epicenter in Oakland’s Montclair neighborhood.

That quake was close to the Hayward fault.California Unshaken is the L.A.

Times newsletter guide to earthquake readiness and resilience.Sign up for this six-week course to get you ready for a major earthquake in California.San Ramon, one of the largest cities in Contra Costa County, and the surrounding Tri-Valley area, is no stranger to earthquake swarms, according to Annemarie Baltay, a U.S.

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