Journal articles: 'Walker Lane'

1

Wesnousky, Steven G. "Active faulting in the Walker Lane." Tectonics 24, no. 3 (June 2005): n/a. http://dx.doi.org/10.1029/2004tc001645.

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Lifton, Zachery M., Jeffrey Lee, Kurt L. Frankel, Andrew V. Newman, and Jeffrey M. Schroeder. "Quaternary slip rates on the White Mountains fault zone, eastern California: Implications for comparing geologic to geodetic slip rates across the Walker Lane." GSA Bulletin 133, no. 1-2 (June 16, 2020): 307–24. http://dx.doi.org/10.1130/b35332.1.

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Abstract The White Mountains fault zone in eastern California is a major fault system that accommodates right-lateral shear across the southern Walker Lane. We combined field geomorphic mapping and interpretation of high-resolution airborne light detection and ranging (LiDAR) digital elevation models with 10Be cosmogenic nuclide exposure ages to calculate new late Pleistocene and Holocene right-lateral slip rates on the White Mountains fault zone. Alluvial fans were found to have ages of 46.6 + 11.0/–10.0 ka and 7.3 + 4.2/–4.5 ka, with right-lateral displacements of 65 ± 13 m and 14 ± 5 m, respectively, yielding a minimum average slip rate of 1.4 ± 0.3 mm/yr. These new slip rates help to resolve the kinematics of fault slip across this part of the complex Pacific–North American plate boundary. Our results suggest that late Pleistocene slip rates on the White Mountains fault zone were significantly faster than previously reported. These results also help to reconcile a portion of the observed discrepancy between modern geodetic strain rates and known late Pleistocene slip rates in the southern Walker Lane. The total middle to late Pleistocene slip rate from the southern Walker Lane near 37.5°N was 7.9 + 1.3/–0.6 mm/yr, ∼75% of the observed modern geodetic rate.

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Koehler, Rich D., Seth Dee, Austin Elliott, Alexandra Hatem, Alexandra Pickering, Ian Pierce, and Gordon Seitz. "Field Response and Surface-Rupture Characteristics of the 2020 M 6.5 Monte Cristo Range Earthquake, Central Walker Lane, Nevada." Seismological Research Letters 92, no. 2A (January 27, 2021): 823–39. http://dx.doi.org/10.1785/0220200371.

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Abstract The M 6.5 Monte Cristo Range earthquake that occurred in the central Walker Lane on 15 May 2020 was the largest earthquake in Nevada in 66 yr and resulted in a multidisciplinary scientific field response. The earthquake was the result of left-lateral slip along largely unmapped parts of the Candelaria fault, one of a series of east–northeast-striking faults that comprise the Mina deflection, a major right step in the north–northwest structural grain of the central Walker Lane. We describe the characteristics of the surface rupture and document distinct differences in the style and orientation of fractures produced along the 28 km long rupture zone. Along the western part of the rupture, left-lateral and extensional displacements occurred along northeasterly and north-striking planes that splay off the eastern termination of the mapped Candelaria fault. To the east, extensional and right-lateral displacements occurred along predominantly north-striking planes that project toward well-defined Quaternary and bedrock faults. Although, the largest left-lateral displacement observed was ∼20 cm, the majority of displacements were <5 cm and were distributed across broad zones up to 800 m wide, which are not likely to be preserved in the geologic record. The complex pattern of surface rupture is consistent with a network of faults defined in the shallow subsurface by aftershock seismicity and suggests that slip partitioning between east-striking left-lateral faults and north to northwest-striking right-lateral faults plays an important role in accommodating northwest-directed transtension in the central Walker Lane.

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Putirka, K. D., and C. J. Busby. "Introduction: Origin and Evolution of the Sierra Nevada and Walker Lane." Geosphere 7, no. 6 (November 30, 2011): 1269–72. http://dx.doi.org/10.1130/ges00761.1.

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5

Cashman, Patricia H., and Sheryl A. Fontaine. "Strain partitioning in the northern Walker Lane, western Nevada and northeastern California." Tectonophysics 326, no. 1-2 (November 2000): 111–30. http://dx.doi.org/10.1016/s0040-1951(00)00149-9.

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6

Oldow, John S., Gretchen Kohler, and Raymond A. Donelick. "Late Cenozoic extensional transfer in the Walker Lane strike-slip belt, Nevada." Geology 22, no. 7 (1994): 637. http://dx.doi.org/10.1130/0091-7613(1994)022<0637:lcetit>2.3.co;2.

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7

Lifton, Zachery M., Andrew V. Newman, Kurt L. Frankel, Christopher W. Johnson, and Timothy H. Dixon. "Insights into distributed plate rates across the Walker Lane from GPS geodesy." Geophysical Research Letters 40, no. 17 (September 13, 2013): 4620–24. http://dx.doi.org/10.1002/grl.50804.

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8

Angster, Stephen J., Steven G. Wesnousky, Paula M. Figueiredo, Lewis A. Owen, and Sarah J. Hammer. "Late Quaternary slip rates for faults of the central Walker Lane (Nevada, USA): Spatiotemporal strain release in a strike-slip fault system." Geosphere 15, no. 5 (July 29, 2019): 1460–78. http://dx.doi.org/10.1130/ges02088.1.

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Abstract The Walker Lane is a broad shear zone that accommodates a significant portion of North American–Pacific plate relative transform motion through a complex of fault systems and block rotations. Analysis of digital elevation models, constructed from both lidar data and structure-from-motion modeling of unmanned aerial vehicle photography, in conjunction with 10Be and 36Cl cosmogenic and optically stimulated luminescence dating define new Late Pleistocene to Holocene minimum strike-slip rates for the Benton Springs (1.5 ± 0.2 mm/yr), Petrified Springs (0.7 ± 0.1 mm/yr), Gumdrop Hills (0.9 +0.3/−0.2 mm/yr), and Indian Head (0.8 ± 0.1 mm/yr) faults of the central Walker Lane (Nevada, USA). Regional mapping of the fault traces within Quaternary deposits further show that the Indian Head and southern Benton Springs faults have had multiple Holocene ruptures, with inferred coseismic displacements of ∼3 m, while absence of displaced Holocene deposits along the Agai Pah, Gumdrop Hills, northern Benton Springs, and Petrified Springs faults suggest they have not. Combining these observations and comparing them with geodetic estimates of deformation across the central Walker Lane, indicates that at least one-third of the ∼8 mm/yr geodetic deformation budget has been focused across strike-slip faults, accommodated by only two of the five faults discussed here, during the Holocene, and possibly half from all the strike-slip faults during the Late Pleistocene. These results indicate secular variations of slip distribution and irregular recurrence intervals amongst the system of strike-slip faults. This makes the geodetic assessment of fault slip rates and return times of earthquakes on closely spaced strike-slip fault systems challenging. Moreover, it highlights the importance of understanding temporal variations of slip distribution within fault systems when comparing geologic and geodetic rates. Finally, the study provides examples of the importance and value in using observations of soil development in assessing the veracity of surface exposure ages determined with terrestrial cosmogenic nuclide analysis.

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9

Anderson, R. Ernest, Byron R. Berger, and Dan Miggins. "Timing, magnitude, and style of Miocene deformation, west-central Walker Lane belt, Nevada." Lithosphere 4, no. 3 (June 2012): 187–208. http://dx.doi.org/10.1130/l174.1.

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10

Dong, Shaopeng, Gulsen Ucarkus, Steven G. Wesnousky, Jillian Maloney, Graham Kent, Neal Driscoll, and Robert Baskin. "Strike-slip faulting along the Wassuk Range of the northern Walker Lane, Nevada." Geosphere 10, no. 1 (February 2014): 40–48. http://dx.doi.org/10.1130/ges00912.1.

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11

Self, S., and R. S. J. Sparks. "George Patrick Leonard Walker. 2 March 1926 — 17 January 2005." Biographical Memoirs of Fellows of the Royal Society 52 (January 2006): 423–36. http://dx.doi.org/10.1098/rsbm.2006.0029.

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George Walker was one of the most creative, inspirational and influential volcanologists of the twentieth century. Born in Harlesden, London, on 2 March 1926 in a respectable working–class neighbourhood, he was the first member of his family to take an interest in science and to attend university. His father, Leonard Walker, an insurance salesman, was badly wounded at Passchendaele in World War I as a sergeant bomber and never fully recovered. He died in 1932, when George was six years old. His mother, Evelyn Frances ( née McConkey), was a nurse. George had no siblings. He attended Acton Lane Elementary School and recollected a lesson on the making of iron as being memorable. Other influences included natural history, adventure books and visits to the South Kensington Museum and London Zoo. He did well at school and in 1937 won a scholarship to Willesden Secondary School.

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12

Louie, John N., Weston Thelen, Shane B. Smith, James B. Scott, Matthew Clark, and Satish Pullammanappallil. "The northern Walker Lane refraction experiment: Pn arrivals and the northern Sierra Nevada root." Tectonophysics 388, no. 1-4 (September 2004): 253–69. http://dx.doi.org/10.1016/j.tecto.2004.07.042.

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13

CHATFIELD-TAYLOR, WILL, and JEFFREY A. COLE. "A new species of Okanagana from the Walker Lane region of Nevada and California (Hemiptera: Auchenorrhyncha: Cicadidae)." Zootaxa 4868, no. 4 (October 29, 2020): 515–30. http://dx.doi.org/10.11646/zootaxa.4868.4.3.

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Okanagana boweni sp. n. is described from the western margin of the Great Basin of North America. The new species is diagnosed from allopatric O. simulata Davis and sympatric O. utahensis Davis using morphological, bioacoustical, and molecular characters. The distribution of this new species coincides with the Walker Lane region that lies along the border of California and Nevada, USA. Based on geography, bioacoustics, morphology, and molecular phylogenetics, we hypothesize that O. boweni sp. n. is the allopatric sister species of O. simulata.

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14

Petronis, Michael S., John W. Geissman, and William C. McIntosh. "Transitional field clusters from uppermost Oligocene volcanic rocks in the central Walker Lane, western Nevada." Physics of the Earth and Planetary Interiors 141, no. 3 (March 2004): 207–38. http://dx.doi.org/10.1016/j.pepi.2003.12.004.

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15

Hearn, Elizabeth Harding, and Eugene D. Humphreys. "Kinematics of the southern Walker Lane Belt and motion of the Sierra Nevada block, California." Journal of Geophysical Research: Solid Earth 103, B11 (November 10, 1998): 27033–49. http://dx.doi.org/10.1029/98jb01390.

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16

Busby, Cathy J., Alice K. Koerner, Benjamin L. Melosh, Jeanette C. Hagan, and Graham D. M. Andrews. "Sierra Crest graben-vent system: A Walker Lane pull apart within the ancestral Cascades arc." Geosphere 9, no. 4 (August 2013): 736–80. http://dx.doi.org/10.1130/ges00670.1.

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17

Oldow, J. S., C. L. V. Aiken, J. L. Hare, J. F. Ferguson, and R. F. Hardyman. "Active displacement transfer and differential block motion within the central Walker Lane, western Great Basin." Geology 29, no. 1 (2001): 19. http://dx.doi.org/10.1130/0091-7613(2001)029<0019:adtadb>2.0.co;2.

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18

Hammond, W. C., C. Kreemer, I. Zaliapin, and G. Blewitt. "Drought‐Triggered Magmatic Inflation, Crustal Strain, and Seismicity Near the Long Valley Caldera, Central Walker Lane." Journal of Geophysical Research: Solid Earth 124, no. 6 (June 2019): 6072–91. http://dx.doi.org/10.1029/2019jb017354.

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19

Ganev, Plamen N., James F. Dolan, Kurt L. Frankel, and Robert C. Finkel. "Rates of extension along the Fish Lake Valley fault and transtensional deformation in the Eastern California shear zone–Walker Lane belt." Lithosphere 2, no. 1 (February 2010): 33–49. http://dx.doi.org/10.1130/l51.1.

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20

Bormann, Jayne M., Emily A. Morton, Kenneth D. Smith, Graham M. Kent, William S. Honjas, Gabriel L. Plank, and Mark C. Williams. "Nevada Seismological Laboratory Rapid Seismic Monitoring Deployment and Data Availability for the 2020 Mww 6.5 Monte Cristo Range, Nevada, Earthquake Sequence." Seismological Research Letters 92, no. 2A (January 27, 2021): 810–22. http://dx.doi.org/10.1785/0220200344.

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Abstract The Nevada Seismological Laboratory (NSL) at the University of Nevada, Reno, installed eight temporary seismic stations following the 15 May 2020 Mww 6.5 Monte Cristo Range earthquake. The mainshock and resulting aftershock sequence occurred in an unpopulated and sparsely instrumented region of the Mina deflection in the central Walker Lane, approximately 55 km west of Tonopah, Nevada. The temporary stations supplement NSL’s permanent seismic network, providing azimuthal coverage and near-field recording of the aftershock sequence beginning 1–3 days after the mainshock. We expect the deployment to remain in the field until May 2021. NSL initially attempted to acquire the Monte Cristo Range deployment data in real time via cellular telemetry; however, unreliable cellular coverage forced NSL to convert to microwave telemetry within the first week of the sequence to achieve continuous real-time acquisition. Through 31 August 2020, the temporary deployment has captured near-field records of three aftershocks ML≥5 and 25 ML 4–4.9 events. Here, we present details regarding the Monte Cristo Range deployment, instrumentation, and waveform availability. We combine this information with waveform availability and data access details from NSL’s permanent seismic network and partner regional seismic networks to create a comprehensive summary of Monte Cristo Range sequence data. NSL’s Monte Cristo Range temporary and permanent station waveform data are available in near-real time via the Incorporated Research Institutions for Seismology Data Management Center. Derived earthquake products, including NSL’s earthquake catalog and phase picks, are available via the Advanced National Seismic System Comprehensive Earthquake Catalog. The temporary deployment improved catalog completeness and location quality for the Monte Cristo Range sequence. We expect these data to be useful for continued study of the Monte Cristo Range sequence and constraining crustal and seismogenic properties of the Mina deflection and central Walker Lane.

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21

Andrew, Joseph E., and J. Douglas Walker. "Reconstructing late Cenozoic deformation in central Panamint Valley, California: Evolution of slip partitioning in the Walker Lane." Geosphere 5, no. 3 (June 2009): 172–98. http://dx.doi.org/10.1130/ges00178.1.

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22

Busby, Cathy J., Jeanette C. Hagan, and Paul Renne. "Initiation of Sierra Nevada range front–Walker Lane faulting ca. 12 Ma in the Ancestral Cascades arc." Geosphere 9, no. 5 (October 2013): 1125–46. http://dx.doi.org/10.1130/ges00927.1.

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23

Bellier, Olivier, and Mary Lou Zoback. "Recent state of stress change in the Walker Lane zone, western Basin and Range province, United States." Tectonics 14, no. 3 (June 1995): 564–93. http://dx.doi.org/10.1029/94tc00596.

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24

Faulds, James E., Christopher D. Henry, and Nicholas H. Hinz. "Kinematics of the northern Walker Lane: An incipient transform fault along the Pacific–North American plate boundary." Geology 33, no. 6 (2005): 505. http://dx.doi.org/10.1130/g21274.1.

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25

De Masi, Conni, Rich Koehler, Seth Dee, and Amanda Keen‐Zebert. "Early development of strike‐slip faulting: palaeoseismic study along the Petersen Mountain fault, northern Walker Lane, Nevada." Journal of Quaternary Science 36, no. 3 (February 23, 2021): 403–14. http://dx.doi.org/10.1002/jqs.3283.

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26

Gold, Ryan, Craig dePolo, Richard Briggs, Anthony Crone, and John Gosse. "Late Quaternary Slip‐Rate Variations along the Warm Springs Valley Fault System, Northern Walker Lane, California–Nevada Border." Bulletin of the Seismological Society of America 103, no. 1 (February 2013): 542–58. http://dx.doi.org/10.1785/0120120020.

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27

Bormann, Jayne M., William C. Hammond, Corné Kreemer, and Geoffrey Blewitt. "Accommodation of missing shear strain in the Central Walker Lane, western North America: Constraints from dense GPS measurements." Earth and Planetary Science Letters 440 (April 2016): 169–77. http://dx.doi.org/10.1016/j.epsl.2016.01.015.

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28

Lewis, Jonathan C. "Fine-scale partitioning of contemporary strain in the southern Walker Lane: Implications for accommodating divergent strike-slip motion." Journal of Structural Geology 29, no. 7 (July 2007): 1201–15. http://dx.doi.org/10.1016/j.jsg.2007.02.015.

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29

Busby, Cathy J., K. Putirka, Benjamin Melosh, Paul R. Renne, Jeanette C. Hagan, Megan Gambs, and Catherine Wesoloski. "A tale of two Walker Lane pull-apart basins in the ancestral Cascades arc, central Sierra Nevada, California." Geosphere 14, no. 5 (August 7, 2018): 2068–117. http://dx.doi.org/10.1130/ges01398.1.

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30

Li, Xinnan, Weiliang Huang, Ian K. D. Pierce, Stephen J. Angster, and Steven G. Wesnousky. "Characterizing the Quaternary expression of active faulting along the Olinghouse, Carson, and Wabuska lineaments of the Walker Lane." Geosphere 13, no. 6 (October 5, 2017): 2119–36. http://dx.doi.org/10.1130/ges01483.1.

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31

Koehler, Rich D. "Active faulting in the North Valleys region of Reno, Nevada: A distributed zone within the northern Walker Lane." Geomorphology 326 (February 2019): 38–53. http://dx.doi.org/10.1016/j.geomorph.2018.09.015.

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32

Carlson, Chad W., Christopher J. Pluhar, Jonathan M. G. Glen, and Michael J. Farner. "Kinematics of the west-central Walker Lane: Spatially and temporally variable rotations evident in the Late Miocene Stanislaus Group." Geosphere 9, no. 6 (December 2013): 1530–51. http://dx.doi.org/10.1130/ges00955.1.

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33

Gold, Ryan D., Richard W. Briggs, Stephen F. Personius, Anthony J. Crone, Shannon A. Mahan, and Stephen J. Angster. "Latest Quaternary paleoseismology and evidence of distributed dextral shear along the Mohawk Valley fault zone, northern Walker Lane, California." Journal of Geophysical Research: Solid Earth 119, no. 6 (June 2014): 5014–32. http://dx.doi.org/10.1002/2014jb010987.

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34

Domeyer, Joshua, Vindhya Venkatraman, Morgan Price, and John D. Lee. "Characterizing Driver Trust in Vehicle Control Algorithm Parameters." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 62, no. 1 (September 2018): 1821–25. http://dx.doi.org/10.1177/1541931218621413.

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Human factors research in vehicle automation has focused on user interfaces such as performance feedback through visual and auditory displays (Blanco et al., 2015). Another approach is to use vehicle dynamics and vibrations as communicative tools for guiding attention (e.g., Morando, Victor, & Dozza, 2016; Walker, Stanton, & Young, 2006; Wiese & Lee, 2007). In our previous study (Price, Venkatraman, Gibson, Lee, & Mutlu, 2016), we showed that the steering wheel deadband, or lateral movement of the vehicle while maintaining lane position, was negatively associated with trust—more lateral movement led to less trust in the algorithm. The present study extends these findings by using Bayesian statistical methods with new control algorithm data. Although the inclusion of additional algorithm characteristics did not improve the trust model, the use of Bayesian statistical methods provides a useful tool to incorporate prior knowledge into an analysis.

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35

Walker, Matthew. "Architecture, Anatomy, and the New Science in Early Modern London." Journal of the Society of Architectural Historians 72, no. 4 (December 1, 2013): 475–502. http://dx.doi.org/10.1525/jsah.2013.72.4.475.

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Focuses on an important but overlooked building in late seventeenth-century London: the College of Physicians on Warwick Lane designed by the scientist and architect Robert Hooke in the 1670s. The building, which was commissioned in response to the previous college’s destruction in the Great Fire of London in 1666, was itself demolished in the nineteenth century. In this article, Matthew Walker argues that the conception and design of Hooke’s college had close links with the early Royal Society and its broader experimental philosophical program. This came about through the agency of Hooke—the society’s curator—as well as the prominence of the college’s physicians in the experimental philosophical group in its early years. By analyzing Hooke’s design for the college, and its prominent anatomy theater in particular, this article thus raises broader questions about architecture’s relationship with medicine and experimental science in early modern London.

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36

Surpless, Benjamin. "Modern strain localization in the central Walker Lane, western United States: Implications for the evolution of intraplate deformation in transtensional settings." Tectonophysics 457, no. 3-4 (October 2008): 239–53. http://dx.doi.org/10.1016/j.tecto.2008.07.001.

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37

Hoeft, Jeffrey S., and Kurt L. Frankel. "Temporal variations in extension rate on the Lone Mountain fault and strain distribution in the eastern California shear zone–Walker Lane." Geosphere 6, no. 6 (December 2010): 917–36. http://dx.doi.org/10.1130/ges00603.1.

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38

Busby, C. J. "Birth of a plate boundary at ca. 12 Ma in the Ancestral Cascades arc, Walker Lane belt of California and Nevada." Geosphere 9, no. 5 (September 13, 2013): 1147–60. http://dx.doi.org/10.1130/ges00928.1.

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39

Snow, J. Kent, and Anthony R. Prave. "Covariance of structural and stratigraphic trends: Evidence for anticlockwise rotation within the Walker Lane belt Death Valley region, California and Nevada." Tectonics 13, no. 3 (June 1994): 712–24. http://dx.doi.org/10.1029/93tc02943.

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40

Gold, Ryan D., William J. Stephenson, Jack K. Odum, Richard W. Briggs, Anthony J. Crone, and Stephen J. Angster. "Concealed Quaternary strike-slip fault resolved with airborne lidar and seismic reflection: The Grizzly Valley fault system, northern Walker Lane, California." Journal of Geophysical Research: Solid Earth 118, no. 7 (July 2013): 3753–66. http://dx.doi.org/10.1002/jgrb.50238.

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41

Petronis, M. S., P. J. Zebrowski, S. F. Shields, C. J. Pluhar, and J. R. Lindeman. "Vertical Axis Rotation Across the Eastern Mono Basin and West‐Central Walker Lane Revealed by Paleomagnetic Data From the Jack Springs Tuff." Geochemistry, Geophysics, Geosystems 20, no. 4 (April 2019): 1854–88. http://dx.doi.org/10.1029/2018gc007682.

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42

Rood, Dylan H., Douglas W. Burbank, Scott W. Herman, and Scott Bogue. "Rates and timing of vertical-axis block rotations across the central Sierra Nevada-Walker Lane transition in the Bodie Hills, California/Nevada." Tectonics 30, no. 5 (October 2011): n/a. http://dx.doi.org/10.1029/2010tc002754.

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43

Oldow, J. S., J. W. Geissman, and D. F. Stockli. "Evolution and Strain Reorganization within Late Neogene Structural Stepovers Linking the Central Walker Lane and Northern Eastern California Shear Zone, Western Great Basin." International Geology Review 50, no. 3 (March 2008): 270–90. http://dx.doi.org/10.2747/0020-6814.50.3.270.

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44

Wesnousky, Steven G., Jayne M. Bormann, Corné Kreemer, William C. Hammond, and James N. Brune. "Neotectonics, geodesy, and seismic hazard in the Northern Walker Lane of Western North America: Thirty kilometers of crustal shear and no strike-slip?" Earth and Planetary Science Letters 329-330 (May 2012): 133–40. http://dx.doi.org/10.1016/j.epsl.2012.02.018.

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45

Sturmer, Daniel M., and James E. Faulds. "Kinematic evolution of the Olinghouse fault and the role of a major sinistral fault in the Walker Lane dextral shear zone, Nevada, USA." Journal of Structural Geology 115 (October 2018): 47–63. http://dx.doi.org/10.1016/j.jsg.2018.07.006.

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46

Waldien, Trevor S., Andrew J. Meigs, and Ian P. Madin. "Active dextral strike-slip faulting records termination of the Walker Lane belt at the southern Cascade arc in the Klamath graben, Oregon, USA." Geosphere 15, no. 3 (May 1, 2019): 882–900. http://dx.doi.org/10.1130/ges02043.1.

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47

Lee, Jeffrey, Jason Garwood, Daniel F. Stockli, and John Gosse. "Quaternary faulting in Queen Valley, California-Nevada: Implications for kinematics of fault-slip transfer in the eastern California shear zone–Walker Lane belt." Geological Society of America Bulletin 121, no. 3-4 (February 5, 2009): 599–614. http://dx.doi.org/10.1130/b26352.1.

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48

Walker, T. J., S. N. Collins, and R. C. Murray. "Horse walker use in dressage horses." Comparative Exercise Physiology 8, no. 1 (January 1, 2012): 63–70. http://dx.doi.org/10.3920/cep11015.

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Horse walkers have become popular in the modern exercise regime for dressage horses, however recent investigations of injury risk factors have indicated a significant association between horse walker use and lameness. A detailed telephone questionnaire was conducted to document horse walker usage and assess whether horse walker use could predispose dressage horses to lameness. Information on horse walker features and use, and individual horse lameness history was recorded. Chi-squared tests were performed to identify horse walker variables associated with lameness. Although analyses failed to establish a direct link between lameness and any specific horse walker feature, the high proportion of lame horses in this study suggests that there is an underlying and, as yet, unidentified cause of lameness related to horse walker usage.

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49

Petronis, Michael S., John W. Geissman, John S. Oldow, and William C. McIntosh. "Paleomagnetic and 40Ar/39Ar geochronologic data bearing on the structural evolution of the Silver Peak extensional complex, west-central Nevada." GSA Bulletin 114, no. 9 (September 1, 2002): 1108–30. http://dx.doi.org/10.1130/0016-7606(2002)114<1108:paaagd>2.0.co;2.

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Abstract The Silver Peak extensional complex, located in the Silver Peak Range of west- central Nevada, is a displacement-transfer system linking the Furnace Creek–Fish Lake Valley fault system and transcurrent faults of the central Walker Lane. Late Neogene, northwest-directed motion of an upper plate, composed of lower Paleozoic sedimentary rocks and late Tertiary volcanic and volcaniclastic strata, exhumed a lower-plate assemblage of metamorphic tectonites with Proterozoic and Mesozoic protoliths. Paleomagnetic investigation of Miocene–Pliocene pyroclastic and sedimentary rocks of the upper plate and Miocene mafic dikes in the lower plate reveals modest horizontal- axis tilting (northwest-side-up) and vertical-axis rotation (clockwise) within the extensional complex. Eight to ten samples from each of 123 sites were demagnetized; 95 sites yielded interpretable results. Dual- polarity results from one population of mafic dikes in the lower-plate assemblage indicate moderate, northwest-side-up tilting (declination D = 329°, inclination I = 37°, α95 = 4.3°, number N = 30 sites; in situ) (α95 = the confidence limit for the calculated mean direction expressed as an angular radius from the calculated mean direction). Some dikes yield exclusively normal-polarity results that are interpreted to indicate modest clockwise vertical-axis rotation (D = 021°, I = 57°, α95 = 4.3°, N = 19 sites; in situ) concurrent with uplift of the lower-plate rocks, and nine sites yield magnetization directions that are north-directed with positive inclinations of moderate steepness, similar to an expected Miocene field. Late Miocene pyroclastic rocks in the upper plate yield normal-polarity magnetizations suggestive of moderate, clockwise, vertical-axis rotation (D = 032°, I = 53°, α95 = 8.8°, N = 10 sites). The apparent clockwise rotation is unlikely to result from incomplete sampling of the geomagnetic field, because the overall dispersion of the VGP (virtual geomagnetic pole) positions is high for the latitude of the site location. Middle Miocene sedimentary rocks probably were remagnetized shortly after deposition. Of eight 40Ar/39Ar determinations from mafic dikes in the lower plate, five groundmass concentrates yield saddle-shaped age spectra, and one separate provided a plateau date of low confidence. Isochron analysis reveals that all six groundmass concentrates contain excess Ar. If rapid cooling and Ar retention below ∼250 °C are assumed, the preferred age estimate for mafic intrusions is provided by isochron dates and suggests emplacement between 12 and 10.5 Ma. The 40Ar/39Ar age-spectrum data are consistent with existing fission-track cooling and K-Ar isotopic age information from lower-plate granitic rocks and indicate rapid cooling of the lower-plate assemblage from well above 300 °C to 100 °C between 13 and 5 Ma. Rapid cooling may explain the overall distribution of paleomagnetic results from lower-plate intrusions such that the earliest acquired magnetizations reflect both northwest-side-up tilt and clockwise rotation and the younger magnetizations reflect northwest-side-up tilt. Overall, the paleomagnetic data from the Silver Peak extensional complex are interpreted to suggest that vertical-axis rotation of crustal-scale blocks, associated with displacement transfer in the central Walker Lane, may play an integral part in accommodating strain within a continental displacement-transfer system.

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Plattner, C., R. Malservisi, K. P. Furlong, and R. Govers. "Development of the Eastern California Shear Zone — Walker Lane belt: The effects of microplate motion and pre-existing weakness in the Basin and Range." Tectonophysics 485, no. 1-4 (April 2010): 78–84. http://dx.doi.org/10.1016/j.tecto.2009.11.021.

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Journal articles on the topic 'Walker Lane'

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