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| Yerington Fault | |
|---|---|
| Name | Yerington Fault |
| Location | Mason Valley, Lyon County, Nevada, United States |
| Coordinates | 39°6′N 119°5′W |
| Type | Normal fault |
| Length | ~35 km |
| Displacement | variable; meters to hundreds of meters |
| Age | Miocene–Quaternary |
| Plate | North American Plate |
Yerington Fault The Yerington Fault is a major normal fault system in western Nevada associated with Basin and Range extension near Mason Valley, Yerington, and the Walker River drainage. It links to regional structures that include the Carson Range, Sierra Nevada, and the Gulf of California–linked extensional province, and it has been the focus of studies by institutions such as the United States Geological Survey, Nevada Bureau of Mines and Geology, and university groups from University of Nevada, Reno and Stanford University.
The fault system bounds tilted fault blocks of Miocene volcanic and Oligocene–Miocene granitic suite that include exposures of the Sierra Nevada Batholith, Dogtown Mountains, and the Toiyabe Range. Stratigraphic units juxtaposed across the fault include the Reno volcanic field products, Lucky Shot Tuff–type ignimbrites, and silicic intrusive rocks correlated with regional plutons mapped by the Geological Society of America–affiliated studies. Structural mapping shows steeply dipping normal faults, listric geometries, and relay ramps linking splays to larger discontinuities mapped using methods from the U.S. Geological Survey and geologists affiliated with the American Geophysical Union.
Situated within the Basin and Range Province that stretches from Great Basin National Park toward the Colorado River, the Yerington Fault records extension related to Pacific Plate–North American Plate interactions, transtensional stresses transmitted from the San Andreas Fault system and the Walker Lane. Seismic catalogs maintained by the Southern California Earthquake Center, USGS National Earthquake Information Center, and the Nevada Seismological Laboratory document background seismicity, microseismic swarms, and historic events on related faults such as the 1994 Northridge earthquake basin-scale analogs. Paleoseismic trenches correlated with radiocarbon ages and K–Ar dates link activity to regional episodes contemporaneous with deformation documented at sites like Mono Basin and the Carson Sink.
Miocene extension, contemporaneous with large silicic volcanism at centers analogous to Long Valley Caldera and ignimbrite flare-ups documented in the Nevada volcanic field, produced initial faulting. Late Quaternary reactivation is inferred from offset alluvial fans near Midas–era placers, geomorphic scarps studied by teams from California Institute of Technology and University of California, Berkeley, and cosmogenic nuclide exposure ages coordinated with datasets from Lamont–Doherty Earth Observatory. Historical catalogs curated by the National Oceanic and Atmospheric Administration and paleoseismic syntheses published through the Seismological Society of America integrate evidence for multiple surface-rupturing events in the late Pleistocene to Holocene.
The Yerington area is notable for porphyry and epithermal mineral systems analogous to deposits around Carlin Trend, Battle Mountain, and historic mining districts such as Yerington District mines, Anaconda Copper–era workings, and deposits described by the Nevada Bureau of Mines and Geology. Hydrothermal alteration halos, vein systems, and skarn assemblages occur along fault-controlled fluid pathways evaluated by economic geology groups at Colorado School of Mines and industry partners including Newmont Corporation and past operators like Kennecott Utah Copper. Geochemical anomalies in soil and stream sediment surveys coordinated with the U.S. Geological Survey highlight associations with gold, copper, and molybdenum mineralization.
The fault expresses as linear escarpments, offset drainages, and shutter ridges in the Mason Valley physiographic mosaic studied in regional mapping by the USGS Professional Paper series and airborne LiDAR campaigns funded by the National Science Foundation. Surface features correlate with displaced fan surfaces near Yerington, ponded paleolake deposits linked to Pleistocene Lake Lahontan, and slope-break terraces that have been dated using techniques developed at institutions like the University of Washington and Columbia University. Vegetation patterns near the escarpments are compared with botanical records from Great Basin National Park and local land management by the Bureau of Land Management.
Active research involves paleoseismic trenching by teams from University of Nevada, Reno, geodetic surveys using Global Positioning System networks coordinated with the Plate Boundary Observatory, and InSAR studies processed by groups at Jet Propulsion Laboratory and NASA. Collaborative projects with the Nevada Seismological Laboratory and international partners in the Institute of Geophysics, University of Tehran–style comparative tectonics use multi-disciplinary approaches including seismology, geomorphology, and geochemistry. Ongoing monitoring feeds into hazard assessments disseminated through agencies like the Federal Emergency Management Agency and the Nevada Division of Emergency Management.
Seismic risk from the fault contributes to regional hazard scenarios affecting communities such as Yerington and infrastructure corridors including U.S. Route 95 and the Mason Valley agricultural irrigation systems managed in cooperation with the United States Bureau of Reclamation. Studies published in journals supported by the American Geophysical Union and Seismological Society of America inform land-use planning by Lyon County and state authorities, and mitigation efforts draw on best practices from case studies like responses to the 1992 Landers earthquake and 1971 San Fernando earthquake.
Category:Faults of Nevada