HAZUS simulation: 1882 Earthquake Geology, Hazards November 8, 1882 Case Study: The Big One It has been 140 years since “The Big One”: Colorado’s largest historic earthquake: November 7, 1882 – Magnitude 6.6. On Tuesday, November 7, 1882 at about 6:30 p.m. local Denver time, a moderately strong earthquake shook much of Colorado and parts of southern Wyoming and northeastern Utah. The following quote…