The intensity of shaking felt during Sunday's magnitude-6.0 earthquake centered in Napa appears to have rivaled the motion felt at the epicenter of the Northridge magnitude-6.6 earthquake in 1994.
An estimate posted on the
The perceived shaking during the Northridge quake was also a level IX.
Intensity of shaking is different than the magnitude, which is a number that represents total energy released during an earthquake.
It's possible, however, that the intensity level could be downgraded later by the USGS, said state geologist John Parrish.
It's important to point out that there was far more land that suffered from intensity IX shaking during the Northridge earthquake than in the Napa area, Parrish said.
"There has been substantially less damage in the Napa area than there was at Northridge," Parrish said.