Residents of the San Ramon Valley are set to hear from a seismologist about a recent surge in earthquake activity that has drawn attention across the region. A researcher from the Berkeley Seismological Laboratory will speak Friday at the San Ramon Community Center, addressing why nearly 100 earthquakes have been recorded in the valley over the past 30 days.

The most significant event occurred on the morning of February 2, when a magnitude 4.2 tremor shook the area. The quake was widely felt and became the focal point of public concern. In the months leading up to it, dozens of smaller earthquakes were detected, forming what experts describe as an earthquake swarm. Despite the frequency of activity, officials have reported no injuries or structural damage.

Scientists say earthquake swarms are not unusual in California, particularly in areas influenced by active fault systems such as the Calaveras Fault. Annemarie Baltay, a research geophysicist with the U.S. Geological Survey, said the recent activity does not necessarily signal a larger earthquake. While residents may fear a stronger temblor, there is no clear evidence that the swarm is a precursor to a major event.

Researchers are studying the recent seismic activity to better understand how underground fractures are forming and interacting with the Calaveras Fault. They are also examining how fluids, most likely water, may be influencing fault behavior. Data gathered from the swarm will help improve earthquake monitoring and hazard assessment in the Bay Area.