MONO COUNTY, CA - Tuesday morning, a preliminary 2.5 magnitude quake was recorded near Mammoth Lakes, according to the U.S. Geological Survey.

In California's East Bay, a recent swarm of small earthquakes has pushed long-standing seismic risks back into public view. Since early November 2025, at least 90 minor quakes have been recorded around San Ramon,

SAN RAMON — A cluster of earthquakes struck the San Ramon area Friday night, continuing a pattern of seismic activity in recent weeks, according to the U.S. Geological Survey. Things kicked off at 7:41 p.m. with a magnitude 2.5 centered 3.1 miles southeast of the city.

California's seismic risk is increasing with supershear earthquakes, which are faster and more destructive than typical earthquakes.

Jack Creek Farms experienced 78 measurable earthquakes from Nov. 18 to Dec. 22, according to the U.S. Geological Survey. Earthquakes always occur on a fault, which is a break in the Earth’s crust where blocks of rock can move back and forth, Lozos said.

Major quakes in Japan and Alaska along with a spate of smaller earthquakes in California this fall make folks ask, is the Big One near?

On Monday morning, around 30 minor earthquakes erupted in a swarm near the Geysers geothermal field south of Clear Lake. The day before, seven quakes rattled Sonoma County, including a 4.0 quake. The recent uptick isn’t out of the ordinary, according to U.S. Geological Survey seismologist Susan Hough.

The quake came only eight days after three earthquakes shook the area in the course of about 100 minutes. More than 30 quakes also were recorded between midnight and 10:15 a.m. on Dec. 8, according to CalTech’s California Earthquake Center.

Belief in “earthquake weather" is common, especially in California, but scientists are clear that there is no such thing.

Earthquakes have continued to hit California for days at a stretch, with several tremors felt across Bay Area, San Ramon, Hayward, Dublin, Pleasanton on Friday.