It was only nerves that were shaken today near Reno as a 4.7 magnitude earth tremor hit areas of Northern California and Nevada on Thursday.
The epicenter was 35 miles from Reno, Nev., and 90 miles from Sacramento, Calif. according to the U.S. Geological Survey.
Another minor quake occurred close to San Francisco, Calif. with a 3.6 magnitude, both quakes occurring within the past 24-hours and neither with any damage reported.
There are seven faults that run through Northern California, and hundreds of fault lines in and around the California – Nevada border. Several earthquakes have been caused as a result of these faults in the past several days.
Aftershocks as a result of the Northern California faults, along with the rarer pre-shocks, are numerous in the Pacific Rim. There have been 1,200 earthquakes in a 10-kilometer radius around San Francisco alone.
According to experts, these smaller quakes do not "release the pressure" for a large earthquake.
Regarding "The Big One," Seismic expert Dr. Robert Uhrhammer, says that there is a 65 percent chance of a quake bigger than 6.7 occurring in the next 30 years — but a 1 percent chance a 7.0 earthquake will occur every year.