According to USGS data, the seven earthquakes occurred over a span of two days and were centered near the city of Santa Rosa in Sonoma County. Preliminary readings placed the epicenters predominantly along or near the Rodgers Creek Fault, a fault known for its seismic activity and historical potential for damaging earthquakes.

A light, 4.1-magnitude earthquake struck north of San Francisco on Monday, according to the United States Geological Survey. The temblor happened at 7:08 a.m. Pacific time about 1 mile northwest of The Geysers, Calif., data from the agency shows. U.S.G.S. data earlier reported that the magnitude was 4.1.

It’s been a full week of earthquakes in California, including a 4.1 near Templeton that triggered an alert for residents. “This week is a bit busy,” Minson said. “But earthquakes are not uniformly spaced out in space and time, so this is all within the normal variation for earthquakes.”

The California Geological Service deploys Watershed Emergency Response Teams following some fires to assess threats to life and property. They use satellite data collected by federal agencies, whose debris flow hazard websites were not updated during the 43-day federal government shutdown and could be imperiled in future funding lapses.

A magnitude 4.1 earthquake shook parts of Lake and Sonoma counties on Monday, the U.S. Geological Survey said.

A magnitude-3.9 earthquake shook parts of Northern California, near Sonoma County, on Monday morning, according to the U.S. Geological Survey.

Eastern California is the perhaps the best place in the country to learn geology. The deserts beyond the Sierra Nevada host glacial features, volcanoes and rivers. Beautiful stratigraphic layers are cut by fault lines and laid bare by erosion. “There are ...

California’s state geologist has concluded that an active earthquake fault is underneath a massive proposed skyscraper project in Hollywood, setting the stage for a huge battle at City Hall over growth and seismic safety. The California Geological Survey ...