| This study documents the style of faulting and fault-related morphology along the Osgood Mountains rangefront in the Northern Basin and Range, about 45 km east of Winnemucca, Nevada. The motivation for this study is to document the characteristics and constrain the frequency of surface-rupturing earthquakes within the region. Results from trench excavations, geologic mapping, scarp profiling, and soil profile descriptions provide qualitative constraints on the timing and frequency of paleoearthquakes as well as a glimpse at the evolution of the mountain range over 0.5 ma. Colluvial wedges within the trench exposure are interpreted to suggest four to five earthquakes after the deposition of the Rockland tephra (590 ka) in footwall lacustrine sediments. The tephra further documents the presence of a very high lake in Red House Flat above 1,412 m at 590 ka. |
