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 reg

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