Depending on where you live, you could be in an area with a higher possibility of having an earthquake. You can find out the likelihood that your state will have an earthquake by going to:
http://earthquake.usgs.gov/hazards/products/conterminous/2014/HazardMap2014_lg.jpg
This is the map of potential earthquake risk; Western WA and OR have a high risk of earthquake while AZ has a lower probability.
To check out a real time earthquake map:
http://earthquake.usgs.gov/earthquakes/map/
This map tells you magnitude of the earthquake as well as where it was located and when.