Several earthquakes, the largest measured at magnitude-3.1, were reported Thursday morning in Ventura County, the USGS says.
The earthquakes were centered near Fillmore, about 25 miles northeast of Ventura. Weak shaking from the magnitude-3.1 quake was reported in Fillmore, Moorpark, Ventura and Santa Paula, according to the USGS.
The quake was initially measured at magnitude-3.3, but later downgraded.
More than a dozen other earthquakes were reported in the same area, including at least six greater than magnitude-2.0.
In 2015, an area west of Fillmore was the site of a notable earthquake swarm.
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A USGS map displays earthquakes reported Thursday Dec. 11, 2025 near Fillmore in Ventura County.
Did you feel it?
Whether you feel shaking from an earthquake largely depends on three major factors — magnitude, distance and local soil conditions. Magnitude refers to the strength of the quake. The closer your location to the epicenter, the more likely you’ll feel the effects of seismic waves that become less intense as they move out from the fault. Generally, the looser the soil under your location, the greater the amplification.
Aftershocks
Some earthquakes are followed by a larger earthquake, in which case the first quake would then be called a foreshock. For example, the magnitude-9.1 Japan earthquake and tsunami in 2011 was preceded by a magnitude-7.3 foreshock two days earlier.
Aftershocks decrease over time, but can continue for days, weeks, months and years.
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