https://tucson.com/news/earthquake-in-e-arizona-shakes-tucson/article_fdf95168-ff4b-11e3-833c-001a4bcf887a.html

Earthquake Information for Pima County, Arizona

Pima County, AZ has a moderate earthquake risk, with a total of 386 earthquakes since 1931. The USGS database shows that there is a 10.79% chance of a major earthquake within 50km of Pima County, AZ within the next 50 years. The largest earthquake within 30 miles of Pima County, AZ was a Magnitude in .