1867 Manhattan, Kansas earthquake
The Humboldt Fault Zone, found here, is responsible for many earthquakes in Kansas. This fault goes through Permian rock and might be more complicated than people thought before. The earthquake was felt across a huge area, about , although some sources listed the felt area as , or . This broad reach happened because of the specific geology in the region. Unlike coastal areas where earthquakes are often confined to smaller regions, in Kansas, they spread out widely due to the firm ground and their relatively shallow depth.