Late Pleistocene - Holocene ruptures of the Lima Reservoir fault, SW Montana

► The segmented Lima Reservoir fault is young and active. ► Morphologic fault scarp modeling defines Pleistocene and Holocene ruptures. ► Rupture ages signify seismogenic linkage of Lima Reservoir fault segments. ► The average slip rate of Lima Reservoir fault was ∼0.3 m/ka but non-steady. ► The Lima Reservoir fault allows differential extension across the Centennial shear zone.