Earthquakes are caused bymovement on faults. It is important to understand the past behavior of faults in Colorado in order to understand what is the future hazard.

Paleoseismicityis the discipline of trying to determine the past movement behavior of faults.

Sackungenare a special category of faults that disrupt theground surface in glaciated, alpine areas. They are not interpreted to extend very deep into the crust and are probably not capable of generating earthquakes. However, they can potentially yield information on past earthquakes on nearby faults.

For more on Colorado faults, access the
Earthquake and Late Cenozoic Fault and Fold
Map Server