"Seismologists call the sequence of small earthquakes a 'swarm' and say it is normal for this part of the Bay Area, which lies atop a spiderweb of active faults."
"It's very likely that the fault goes down, turns, dips and moves around. This will help us sort of understand that fault structure at depth."
"Mark Armstrong, mayor of San Ramon, lives in a two-story home smack dab in the epicenter of the recent swarm of quakes. He said the shaking he feels is a reminder that he lives in earthquake country."
"Residents have one burning question: 'When is it going to stop?'"
"The findings could also show how different soils affect how waves travel through the earth."
A series of small earthquakes, termed a 'swarm', has occurred in the San Ramon Valley, a region known for its active faults. Seismologists are investigating the cause and potential implications of these quakes, which may indicate the risk of a larger earthquake. The findings could necessitate changes to the USGS's National Seismic Hazard Model, impacting local building codes and insurance. Residents, including Mayor Mark Armstrong, express concern and curiosity about the duration of the seismic activity.
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