A recent cluster of earthquakes have been felt near Templeton, but seismologists say the activity is likely part of a normal aftershock sequence following a larger quake last month.
According to the U.S. Geological Survey, at least three earthquakes measuring magnitude 3.0 or higher have occurred near Templeton over the past two months—the most recent one on Dec. 12 measuring at 3.4. The most significant was a magnitude 4.1 earthquake recorded on Nov. 18, which likely triggered the subsequent shaking.
“California is a seismically active state, and earthquakes happen all the time,” said John Bellini, a geophysicist with the USGS National Earthquake Information Center in Golden, Colorado. “It’s not unusual for a series of felt earthquakes to occur in any given area.”
Bellini explained that the recent tremors are consistent with an aftershock sequence—smaller earthquakes that follow a larger main shock as the Earth’s crust continues to settle.
“An aftershock is just a smaller earthquake after a larger one,” Bellini said. “The fault is still adjusting or moving slightly afterward, but they’re all earthquakes.”
While Templeton does not frequently experience noticeable earthquakes, Bellini said that does not make the recent activity unusual. California is crisscrossed by numerous faults, many of which are unnamed or poorly mapped, particularly in areas away from major fault zones.
“I don’t see any specifically named faults associated with these earthquakes,” Bellini said. “But California has faults all over the place, and they’re generally related to the broader tectonic system, including the San Andreas Fault.”
Earthquakes are measured using the Richter magnitude scale, which is logarithmic meaning each whole number increase represents a significant jump in strength. Bellini said each increase in magnitude represents 10 times the ground motion and roughly 32 times more released energy.
“So when you go from a magnitude 3 to a magnitude 4, that’s a big jump in energy,” Bellini said. “Each step up releases a lot more energy than the previous one.”
Despite that increase, Bellini said earthquakes in the magnitude 3 to 4 are considered relatively minor. Damage is generally limited at those levels, though residents may feel shaking indoors.
“Around magnitude 4, you might see things knocked off shelves or minor damage in older brick buildings,” he said. “But we wouldn’t expect widespread or serious damage from an earthquake of that size.”
Bellini emphasized that aftershock sequences can continue for weeks or even months after a larger earthquake, gradually decreasing in frequency and intensity over time.
Some residents have taken to Facebook and Nextdoor to express relief that the recent quakes have been relatively small.
“I’ll take a hundred of these little ones over one monumentally huge and tragic quake. Each of these little ones release a tiny amount of tension along the fault so when ‘the big one’ does hit us it’s not as extreme as it could have been,” Paso Robles resident Jefferson Malone shared on Nextdoor.
Residents are encouraged to stay informed and prepared, but the recent activity doesn’t indicate an increased risk of a major earthquake in the immediate future, Bellini said.
“From what we’re seeing, this looks like typical aftershock behavior,” he said. ∆
This article appears in Dec 18-25, 2025.