A preliminary magnitude 3.6 earthquake rattled San Bernardino County late Monday evening, marking the third temblor to hit the region within a 12 hour time period, according to the United States Geological Survey.

Twin earthquakes shocked California today, just four miles from San Bernardino, registering at about 3.5 on the Richter scale, as X quickly lit up with posts that said the quake felt like 'jolts that rattled nerves and frightened pets.