A swarm of at least six earthquakes reaching up to magnitude 2.9 rattled San Ramon near San Francisco, the U.S. Geological Survey reports.

A 3.7 earthquake rattled San Ramon on Monday morning, following several earlier small quakes in the area, according to the U.S. Geological Survey. These come after a cluster of earthquakes in the last few weeks.

The clusters of earthquakes 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.

People in the Bay Area continue to experience the “flare up” of earthquakes into Monday afternoon, Oakland being the latest city to experience a jolt.