EARTHQUAKE GROUND SHAKING HAZARD MAPS FOR THE STATE OF MONTANA

Seismic hazard maps are a useful tool for regulatory agencies that are responsible for the safety of important and critical facilities particularly if their area of responsibility is large and geologically and seismically diverse and if they manage a large inventory. Western Montana, located in the northern Intermountain region of the U.S., is characterized by abundant late-Quaternary Basin and Range normal faulting and historical seismicity. In contrast, eastern Montana is similar to other portions of the Great Plains in the central U.S., with only two known faults of possible late-Quaternary age and a relatively low level of seismicity.

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