The United States Geological Survey identifies about 20,000 earthquakes per year, and while these earthquakes are mainly small, the risk of a major earthquake should be a concern. CoreLogic staffer Maiclaire Bolton takes a look at the earthquake activity around the U.S. and some of the worst earthquakes in the history of this country.

Bolton points out that while California has had the highest seismic hazard, earthquake risk in the country extends beyond the Golden State. Notable regions that have experienced seismic activity include Oklahoma, northern Texas, and southern Kansas:

A recent study by the USGS indicates there are increasingly more earthquakes in Oklahoma than there are in California. The rapid increase of earthquakes in Oklahoma and surrounding areas is highly correlated with oil and gas exploration, specifically the injection of waste fluid, a byproduct of the hydraulic fracturing process.

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