The Walker Lane is composed of discontinuous sets of right-slip faults that are located to the east and strike approximately parallel to the San Andreas fault system. The Walker Lane takes up 15 to 25 percent of the boundary motion between the Pacific Plate and the North American Plate, the other 75 percent being taken up by the San Andreas Fault system to the west. Between Wadsworth and Pyramid Lake, the Truckee River follows the path of an important zone of faults called the Walker Lane, which began to develop approximately 13 million years ago. In comparison, the San Andreas Fault contains one singular, mature, and well-mapped strand. processes involved in strain localization.!!!! The Walker Lane may represent an incipient major transform fault zone which could replace the San Andreas as the plate boundary in the future. The results of the field study The Pyramid Lake Fault Zone is an active right lateral-moving (dextral) geologic fault located in western Nevada. Modern Tectonic Context ! 5 may be analogous to an earlier stage in the structural development of the San Andreas when the system was transtensional and before sufficient slip accumulated to yield the now throughgoing San Andreas fault. processes involved in strain localization.!!!! Without these two faults and the depression left behind, there would be no Walker Lake. The Walker Lane takes up 15 to 25 percent of the boundary motion between the Pacific Plate and the North American Plate, the other 75 percent being taken up by the San Andreas Fault system to the west. This was the Walker Lane. We apply recently acquired 0.5-1 m/pixel lidar data and terrestrial cosmogenic nuclide (TCN) surface exposure ages to characterize the geometry, Quaternary expression, and slip rates of active faults in these three valleys. We have been using geologic, geomorphic, and paleoseismic studies to better understand how the fault system serves to accommodate plate motion. Provides a clear record of rift initiation… !! The fault zone extends to the southeast from Pyramid Lake roughly parallel to the course of the Truckee River between the Truckee Range to the northeast and the Pah Rah Range to the southwest. and a time-transgressive view of!! Geologically speaking, the Walker Lane is a relatively young system that contains a complex series of faults, many of which have not been mapped because they are either difficult to trace or don’t reach the surface. Provides a clear record of rift initiation… !! Collection Overview: PI: Steven G. Wesnousky, University of Nevada, Reno The requested survey area consisted of 1-km wide swaths centered along 335 km of fault centerlines. Modern Tectonic Context ! For context, I first review available observations describing strain accumulation and the history of slip on faults within the Eastern California Shear Zone and Walker Lane. and a time-transgressive view of!! Next came the present day fault system known as the Walker Lane Fault system. The Walker Lane fault pattern within the area of Fig. The Walker Lane is a geologic trough roughly aligned with the California/Nevada border southward to where Death Valley intersects the Garlock Fault, a major left lateral, or … The Walker Lane fault pattern within the area of Fig. The first fault along this mountain range was called the Pine Nut Fault. The earthquake occurred in the Walker Lane seismic belt that extends along the eastern side of the Sierra Nevada and accommodates about 10–25% of the Pacific/North American plate boundary motion. The idea of migration of plate boundary migration of strain release to newer (relatively speaking) faults is interesting and I see similar possibilities/pattern in the NE corner of the South Island of New Zealand. Walker Lane rift system - currently accommodates 20-25% of the plate motion between the Pacific and the North American plates!!