Distributed extensional deformation in a zone of right‐lateral shear: Implications for geodetic versus geologic rates of deformation in the eastern California shear zone‐Walker Lane

摘要: [1] The eastern California shear zone (ECSZ)-Walker Lane belt represents an important, evolving component of the Pacific-North America plate boundary. Geodetic data suggest northern ECSZ is accumulating dextral at a rate ∼9.3 mm/a, more than double total measured late Pleistocene ∼37.5°N. At this latitude, Silver Peak-Lone Mountain (SPLM) extensional complex plays important role in accommodating and transferring slip among strike-slip normal faults Walker Lane. To better understand recent geodynamic evolution region, we determined extension rates for Clayton Valley fault zone, one series down-to-the-northwest comprising SPLM, using geologic mapping, differential GPS scarp surveys, cosmogenic nuclide geochronology. Extension along are time-invariant 0.1 ± to 0.3 0.1 mm/a (depending on dip) since ∼137 ka. When combined with other published cumulative ∼3.3 5.2 mm/a. This lower both geodetic long-term budgets ECSZ. Our results that deformation spread across diffuse set not all recorded surficial geology. We low may be result distributed extension, which can cause significantly underestimated.